What are PAR, PPF, PPFD and How to do the measurement

When LEDs arrived on the market, their tremendous efficiency and money saving potential changed the playing field and lumens, lux and candela finally became obsolete metrics for determining light requirements for plants.

Recently, people began referring to PAR, PPF and PPFD as ways to measure light in photosynthetics lighting applications. The purpose of this article is to explain what these terms mean, correct some common misunderstandings and help growers understand how the science behind these terms can be used to determine proper light levels to grow happy, thriving plants.

What the is PAR?

Our LED fixtures emit extremely high PAR levels, PAR (Photosynthetically Active Radiation) is a much used (and often misused) term. It defines the type of light (scientists call light “electromagnetic radiation”) needed to support photosynthesis in plant life. Through photosynthesis, plants convert light energy into chemical energy, which is the food they use to grow and thrive.

As we all know, some light (like the light from a candle) is visible to the human eye and some (such as infrared) is not. Scientists define different types of light by their “wavelengths”, these different wavelengths make up the electromagnetic radiation “spectrum”. This spectrum includes X-rays, radio waves and infrared light (none of which are visible to the human eye) and light that we can see such as sunlight, and light from a red or blue LED.

Interestingly, plants use roughly the same part of the spectrum that’s visible to the human eye, but the wavelengths we perceive to be the brightest (i.e. green light) are not the most efficient wavelengths for photosynthesis.

So, the first thing to understand about PAR that it is the part of the electromagnetic radiation spectrum (light) which is useful for plants and algae to activate photosynthesis, the point is PPF and PPFD. When selecting a lighting system or fixture to promote photosynthesis, there have three measurements parameters are important: how much light the fixture produces, how much of that light is available to the plants and how much light the plant receives during the photoperiod.

Definitions:

Photosynthetically Active Radiation (PAR). It’s the basic energy to produce biomass which affects the growth, development, yield and quality of plants directly. PAR defines what’s kind of light source can support plant photosynthesis. The wavelength range of light source to promoting green growth is more wider than photosynthetically active radiation wavelength range, it is roughly at the 300nm to 800nm range, this part of radiation called physiological radiation. Besides it can promote photosynthesis, it also affect other physiological activities.

Photosynthetic Photon Flux (PPF). A measurement of the total light (photons) emitted by a light source each second. PPF tells us how much PAR is emitted by a light source. Measured in “micromoles per second” and expressed as μmoles/second.

LISUN LPCE-2 spectroradiometer integrating sphere system can measure PAR and PPF:

LPCE 2(LMS 9000) Spectrophotometer & Integrating Sphere Test System

Photosynthetic Photon Flux Density (PPFD). The measurement of the light (photons) that reach the target each second. PPFD is measured over a one meter square area in “micromoles per square meter per second” and expressed as μmol/m2/s.

LISUN LMS-6000P portable spectroradiometer can measure PPFD:

LMS-6000 Portable CCD Spectroradiometer

If you have LISUN goniophotometer, you can also put a spectroradiometer sensor inside of the darkroom. Then you can measure PPFD together with color temperature  and candela distribution. Check our LSG-1800BCCD goniospectroradiometer system:



Lisun Instruments Limited was found by LISUN GROUP in 2003.LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Spectroradiometer Integrating Sphere System, LED Test Instruments, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber,  Waterproof Test ,Dustproof Test , High and Low temperature Humidity Chamber, Plug and Switch Testing,etc.


Please feel free to contact us if you need any support.

Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618917996096

Why should you choose a constant current power supply for the LED driver?

The LED is a light-emitting diode, and its characteristic curve is basically the same as that of a normal diode. When the applied voltage reaches the diode conduction voltage, the slight change of the applied voltage can cause a great change in the diode current. The constant current is used to ensure that the current in the LED is constant. No matter how the voltage changes, the current flowing through the LED does not change, which can ensure the life and light decay of the LED.

If a constant voltage source with an output of 12V is used, an electric 16 ohm resistor is connected in series to supply three strings of 0.5W 5630 lamp beads. The lamp voltage is calculated according to 3.3V, the current flowing through the lamp bead Io=(12-3*3.3)/16=0.131A, and the power of a single lamp bead is P=0.131*3.3=0.4323W. Because the temperature of the lamp bead is high The voltage of a single lamp drops to 3V. At this time, the current Io=(12-3*3)/16=0.187A, the current increases by 56 mA., and the power becomes P=0.187*3=0.561 W, which exceeds the lamp power consumption. In the long run, it has a great influence on the life and light decay of LED lamp beads.

Therefore, the key to affecting the life of the LED is the temperature. When the LED temperature rises, the junction resistance decreases, that is, the conduction voltage decreases. At the same voltage, an increase in temperature will cause the LED current to increase, and the current will increase the temperature further, so that the vicious cycle will burn the LED. Moreover, the light decay of LEDs is also related to temperature. When the temperature rises, the light decay is intensified, and the phenomenon of bright and bright is appearing.

There are two reasons for the temperature rise: First, the quality problem, the thermal conductivity of the LED package is poor, the temperature in the LED die is not transmitted to the surface (internal heat and cool), even if the heat sink is added, the internals cannot be completely The heat is dissipated, and then some low-end products do not add a heat sink; the second is the temperature rise caused by the power supply. When the LED is turned on, due to its nonlinearity, the weak change of the power supply will cause a sharp change in the LED current, resulting in temperature.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Spectroradiometer, Integrating Sphere, LED Test Instruments, CFL Test Instruments, Photometer and Colorimeter, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, Waterproof Test , Dustproof Test Chamber, High and Low temperature Humidity Chamber, Plug and Switch Testing, AC and DC Power Supply.


Please feel free to contact us if you need any support.
Tech Dep: Service@Lisungroup.com,Cell/WhatsApp:  +8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp: +8618917996096

The Status of Waterproof Test Equipment in China Market

Waterproof grade reflects the ability of moisture-proof of products. Especially for outdoor activities, it is unavoidable to be in the harsh environment of high humidity. The sealing and water-proof ability of the instrument is very important to ensure the safe of operation and life of the instrument.    

At present, there are many manufacturers producing waterproofing equipment on the market. What are the advantages of LISUN waterproof equipment compared with other manufacturers? There are some advantages for LISUN waterproof in below:

1. On the side of excellent cost performance, In test equipment market, the quality of LISUN waterproof equipment is good than the waterproof equipment of most of suppliers. Please kindly see Figure 1 and Figure 2. Besides, the price of LISUN waterproof test equipment is very competitive in market. Right price with good quality is cost-effective products for our customer to make a good choice for test equipment. Compare to Figure 2, visibly, the surface of material of LISUN waterproof equipment in Figure 1 (LISUN Model:JL-34) has high gloss. And the surface of material in Figure 2 (Other supplier’s Model) have poor gloss. Good material with high gloss makes the equipment more beautiful visually. Regarding to choosing material, LISUN use SUS304 stainless steel as raw material. One more, the regulator in Figure 1 (LISUN Model JL-34) is much better than the regulator in Figure 2.


Figure 1: Surface of IPX3-IPX4 (LISUN Model:JL-34)


Figure 2: Surface of IPX3-IPX4 (Other supplier's model)

2. Speaking of structure of IPX3-IPX4, please kindly see Figure 3 and Figure 4 in below. The waterproof test equipment in Figure 4 (Other supplier’s Model) is Wall-Hanging Split Type, but the waterproof test equipment in Figure 3 (LISUN Mode: JL-34) is Two Cabinets Type. Compare to Wall-Hanging Split Type, two cabinets type is easy to carry. Besides, the cabinets of LISUN model JL-34can be mounted wheels at the bottom, which is more easier for operator to carry and adjust placement.


Figure 3: Two Cabinets Type IPX3-IPX4 test equipment (LISUN Model:JL-34)


Figure 4: Wall-Hanging Split Type IPX3-IPX4 test equipment (Other supplier’s Model)

3. With the view of production details for waterproof test equipment, we can see many welded junctions in Figure 6 and Figure 7(Other supplier’s Model), which not only affects appearance, but also makes it easier for water to erode equipment. please kindly see Figure 5 & Figure 6 & Figure 7 in below. In Figure 5(LISUN Model: JL-34), we can see that the surface of the equipment is clean and glossy, and there is no welded junction.


Figure 5: Production details (LISUN Model:JL-34)


Figure 6: Production details (Other supplier’s Model)


Figure 7: Production details (Other supplier’s Model)

4. Speaking of turntable, we can easily judge the good or bad quality of turntable by through below Figure 8 and Figure 9. After waterproof test equipment is used for a long time, in below Figure 9 (Other supplier’s Model), we can find many rust spots on the machine. In below Figure 8(LISUN Model:JL-34), there is no rust spot on that machine. Thus it can be seen good material can make machine have good corrosion resistance and durability. The turntable of LISUN model JL-34 also mounted wheels at the bottom. This is also more convenient for the operator to move the turntable.


Figure 8: Turntable of IPX3-IPX4 (LISUN Model:JL-34)


Figure 9: Turntable of IPX3-IPX4 (Other supplier’s Model)

5. For swing pipe and spray nozzle for IPX3 and IPX4, compare to Figure 11, the quality of swing pipe and spray nozzle in Figure 10 is better and more elaborate .which also make operator control water flow accurately, and Good parts can make the equipment be used for long term.


Figure 10: IPX3-IPX4 Swing pipe and spray nozzle (LISUN Model:JL-34)


Figure 11: IPX3-IPX4 Swing pipe and spray nozzle (Other supplier’s Model)

6. Regarding to wire of waterproof, please kindly see Figure 12 and Figure 13 in below. Wire is exposing outside of equipment in Figure 13 (Other supplier’s Model). If operator use the machine for a long time in damp environment, that will be easy to make safety issue. So such design for waterproof equipment is not safe for operator. In Figure 12 (LISUN Model: JL-34), Wires are wrapped in plastic pipes, in that way, it can protect operator when operator use equipment. From a safety point of view, LISUN Model is also much better.


Figure 12: Wire of IPX3-IPX4 (LISUN Model:JL-34)


Figure 13: Wire of IPX3-IPX4 (Other supplier’s Model)

In all, before purchasing waterproof test equipment, please consider from different sides. Through the above comparisons, we believe that LISUN waterproof test equipment will be your best choice.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Spectroradiometer, Integrating Sphere, LED Test Instruments, CFL Test Instruments, Photometer and Colorimeter, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, Waterproof Test , Dustproof Test Chamber, High and Low temperature Humidity Chamber, Plug and Switch Testing, AC and DC Power Supply.


Please feel free to contact us if you need any support.

Tech Dep: Service@Lisungroup.com, Cell/WhatsApp: +8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp: +8618917996096

Analysis on the Status of Certified LED Bulb in USA Energy Star

Energy Star certification (Energy Star certification) is a certification which can adapt to the requirements of the United States Energy Department. In addition to UL, FCC certification, it is the most popular certification of lighting products to enter the United States market. UL reflects the goods safety performance, FCC reflects the electromagnetic compatibility of products, while the Star Energy certification reflects the goods energy saving performance of the products. Especially for the current global energy shortage, the United States energy Department has promulgated a series of energy saving plan, and the promotion of energy saving products is the main activity.



Dated on October 2015, the United States on the market with a total 2995 bulb lamp products obtain the United States Energy Star certification, mainly used to replace the 25W, 40W, 60W and 100 watt ordinary lighting with incandescent, which won the 1563 kinds of LED bulb , LED ball was certificated in more than 190 companies.
The product size of the LED bulb is generally A19, A21 and A15 (A). The shape of the bubble is spherical, and the size of the bubble is 19*1/8. LED bulb lamp for E26, E26d, E12 and GU24.

The LED ball is licensed for 2 years, the time is short for years, most of the product warranty time is 3-5 years, and more than 10 years, and even individual enterprise warranty period is 15 years.

The amount of Chinese Certified companies have continued to increase, in more than 190 certified enterprises, Chinese enterprises occupied half, some domestic enterprises designed a variety of products won the energy star certification.
Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Spectroradiometer, Integrating Sphere, LED Test Instruments, CFL Test Instruments, Photometer and Colorimeter, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, Waterproof Test , Dustproof Test Chamber, High and Low temperature Humidity Chamber, Plug and Switch Testing, AC and DC Power Supply.


Please feel free to contact us if you need any support.

Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618917996096

What’s new: IEC 61000-4-5 Second Edition vs. Third Edition

IEC 61000-4-5 is part of the IEC 61000 series, which describes surge immunity testing caused by over-voltages from switching and lightning transients. The second edition of IEC 61000-4-5 was released in 2005 and has been in use for many years. The third edition was released as an EN standard in 2014. The general philosophy of the third edition is unchanged from the second edition. However there have been a number of refinements to the standard: additional explanation to clear up ambiguities, new descriptions that were not included in the second edition, and new (informative) Annexes that can be used to help in the application of the standard.

The purpose of this article is to outline the changes and additions that are now part of IEC 61000-4-5 3rd edition.

Critical Transition Dates

Transition from the second edition to the third edition is already taking place within the EU according to the following dates:19 Mar. 2015 – Date of Publication (dop): The third edition has to be implemented by publication of an identical national standard by CENELEC member countries.

19 June 2017 – Date of Withdrawal (dow): National standards that conflict with the third edition must be withdrawn (i.e. the second edition can no longer be used).

Wave Shape Changes

One simple, seemingly benign addition to the third edition was to add a definition for “duration”: actually three definitions because one voltage waveform duration and two current waveform durations have been defined. This changes how the time of the waveforms are measured, and may have a significant impact on the equipment used to perform some tests. The change most greatly impacts the 8x20uS short-circuit current waveform. Figures 1 and 2 compare the measurement from the 2nd and 3rd editions of the standard. Compare T2 in the second edition to Tw and Td in the third edition.

What’s new: IEC 61000-4-5 Second Edition vs. Third Edition

Another important change to the impulse waveform is that the 1.2×50/8×20 μs wave shape must be within the limits of the standard when the impulse is applied through a Coupling-Decoupling Network (CDN); specifically the 18μF coupling capacitor. While the open-circuit voltage waveform is not affected, the 8×20 μs short-circuit current wave shape will be significantly distorted by the addition of the 18μF capacitor, and the peak output current will be reduced by approx. 10% (depending on the design of the impulse generator). Figure 3 illustrates the problem: the normalized short-circuit output current of a nominal impulse generator is plotted against the same generator output into a 18μF capacitor. With the addition of the 18μF capacitor the peak current is significantly lower, and the waveform duration is shorter.

What’s new: IEC 61000-4-5 Second Edition vs. Third Edition

New CDN and Calibration Requirements

This new Annex A now contains the full description of the 10×700 μs impulse, including the waveform generator, calibration of the generator, the CDN to be used, and the calibration of the CDN. In the second edition (section 6.2) only the waveform, and calibration of the waveform were described. The new Annex A does not change any requirements other than the waveform duration definition previously mentioned. However, new requirements have been added, especially relating to CDN performance.

In the second edition, calibration of the 1.2×50/8×20 μs generator was described in section 6.1.2. In the third edition this is covered in section 6.2.3, and additional details have been added. The updates provide clarification regarding the type of equipment that should be used to perform calibrations, including specifications for current transformers (if used to measure short-circuit current). Similar details have been included in Annex A regarding the 10×700 μs impulse waveform. Section 6.2.3 also makes reference to Annexes E and G of the standard (both are new in the third edition). Annex E is quite useful, as it includes many figures that show the various waveform measurements in detail (rise and duration) for all of the waveforms.

Other Updates and Clarifications

For AC equipment, impulses are applied at 0, 90, 180, and 270-degree phase angles. The third edition provides some clarification for testing three-phase equipment: the phase angle is measured between the two Lines being tested (not Line to Neutral). Also, the new edition points out that when testing from Neutral to Ground, phase matching is not needed (because there should be no voltage from Neutral to Ground) and so this test should be treated similar to DC testing (five positive impulses and five negative impulses).

In summary, the changes in the third edition of IEC 61000-4-5 are likely to impact any organization that performs impulse testing or calibrates impulse test equipment.

Manufacturers of products that are tested to the second edition will most likely not require any product redesign, as the actual impulse tests are relatively unchanged. The third edition should result in a more consistent application of impulse testing, and greater repeatability of test results.

LISUN SG61000-5 Surge Generator is exactly according to the latest version of this IEC standard.

SG61000-5_Surge Generator

  Lisun Instruments Limited was found by LISUN GROUP in 2003.LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Spectroradiometer Integrating Sphere System, LED Test Instruments, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, Waterproof Test ,Dustproof Test , High and Low temperature Humidity Chamber, Plug and Switch Testing,etc.

Please feel free to contact us if you need any support.

Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618917996096

What is color difference SDCM and how to do the measurement?

Color difference is an important indicator of lighting lamps color performance. Color difference is the difference between computer calculation forma and the target standard, calculated by single lighting source, the value is smaller, accuracy is higher. Please note, it only represents the compared color of a light source, it can not detect the deviation under different light sources. Generally speaking, color difference refers to the distance that the measurement value deviates from the target value, the difference between the light source spectrum and the standard spectrum. It needs provide the target value and calculation formula to know the measurement value of color difference.

Standard spectrum changes with color temperature, the color difference is different for the same light source if the standard spectrum is different, but when test, general color photoelectric analysis system can automatically identify the color temperature range where the measured light source is, to determine the color temperature value of standard spectrum. When the color temperature is same, reference standard spectrum is consistent, chromaticity coordinate X,Y is different, the color difference is also different.

Color difference unit: SDCM. National standard has its specific testing requirement, IEC 60901 and GB-T17262 single-ended fluorescent lamp performance requirements specified in the standard that general energy-saving lamps require color tolerance less than 5 SDCM. IEC 62717 and GB24823 general lighting for LED modules performance requirements specified in the standard that LED modules require color difference less than 7SDCM. In the ellipse of 5SDCM, color difference is 5 if the point is on the curve of ellipse, color difference is less than 5 if the coordinates is in the circle of ellipse. IEC standard requires that the lamp chromaticity coordinate(x,y) should not deviate the rated value from 5SDCM, that is to say, the chromaticity coordinate of lamp should be in the ellipse, the color difference should be less than 5 SDCM for general energy-saving lamps. For color difference ellipse diagram, outer ring is 6SDCM corresponding to the national standard, inner ring is 5SDCM corresponding to international standard. Industry standard, Energy Star ANSI C78.376, Color Difference≤7SDCM; EU Standard IEC60081, Color Difference≤7SDCM; National Standard GB10682-2002, Color Difference≤5SDCM.

In the fluorescent lamp, as the density of red, green and blue powder is different, it is easy to cause color temperature difference in production. Once appear, it needs adjust color difference to adjust color temperature difference to ensure light color of light. White LED as light source, it should refer to color difference standard requirement to guide the development and application of white LED new lighting source.

Lisun Group’s LPCE-2(LMS-9000A) integrating sphere & spectroradiometer system and LMS-6000 Portable CCD Spectroradiometer can measure SDCM and are widely applied to Luminaries manufacturing enterprise and lab, such as Sharp Electronics in Memphis TN(USA), PT. SHARP SEMICONDUCTOR INDONESIA (Indonesia), TUV Rheinland InterCert Kft.( Hungary), Philips Lighting(Netherlands), Sony Semiconductor Corporation etc.

Here is the software surface of LPCE-2:

What Is Color Difference SDCM And How To Do The Measurement

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Spectroradiometer, Integrating Sphere, LED Test Instruments, CFL Test Instruments, Photometer and Colorimeter, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, Waterproof Test , Dustproof Test Chamber, High and Low temperature Humidity Chamber, Plug and Switch Testing, AC and DC Power Supply.


Please feel free to contact us if you need any support.

Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618917996096

Brief introduction of CE certificates

In recent years, the CE marks are more and more widely used in the market of European economic area (Member states of the European Union and the European Free Trade association, except Switzerland). More customs of different countries set out the requirements of CE certification for imported products. Exporter will be in trouble as well as unnecessary loss if their shipping goods don’t have CE certified label. So, what is the importance of CE certification? What are the forms of CE certification so far? And what are the risks of products that has not been certified by CE?

1. The importance of CE certification

The CE mark on the packaging indicates that it meets the requirements of a series of European directives such as safety, sanitation, environmental protection and consumer protection. In the past, EC(European Community)countries require differently for import and sale of products. The goods which are produced according to national standards may not be on the market. As part of the efforts to eliminate trade barriers, CE came into being at that time. Therefore, CE can be understood as CONFORMITY WITH EUROPEAN (DEMAND) (in Europe).

The meaning of the CE mark is as the following: Using CE acronym as symbol shows products which affix the CE mark meet the main requirements of relevant provisions of the European Directive (Essential Requirements),and it’s also used to verify that the products have passed the conformity assessment procedure or the manufacturer’s declaration of conformity. The CE mark is truly as a passport for the products being allowed to enter the European market. For industrial products which must affix CE mark according to relevant instructions, they can be in the market without CE mark, or they must be taken back if they don’t meet safety requirements but with CE mark and in the market. For industrial products which must affix CE mark according to relevant instructions, they can be in the market without CE mark, or they must be taken back if they don’t meet safety requirements but with CE mark and in the market. Moreover, the products will be restricted and prohibited from entering the EU market or forced to withdraw from the market if they violate CE mark instructions in European Directive.

The most important function of CE is to ensure the safety of the products and ensure the products work well under the conditions of the European union. CE mark like a tickets for products entering the European market, if products are not certified by CE, it’s most likely to be seized of by European customs and cause exporters’ unnecessary losses.

2. Advantages of CE certification

The import of CE certified electronic instruments and equipment can effectively avoid the following risks:

 The risk of being detained and investigated by the customs;

 The risk of being investigated and dealt with by the market supervision institution;

 The risk of being charged by competitor for other purpose;

The import of CE certified electronic instruments and equipment has the following advantages:

 The import of CE certified equipment can avoid a lot of trouble in the import and export because the laws, regulations as well as standards of EU are not only numerous, but also very complex;

 It can enhance the reliability of their product performance by using CE certified equipment for testing or production. It also can effectively prevent the emergence of irresponsible allegations;

 The CE certificate of the institution designated by European Union will be the important evidence with legal effect when you are facing to litigation;

For electronic equipment and testing equipment, there is a very important parameter ” EMC test” when the products are doing CE certification. Because the power grid frequency, voltage in Europe countries are differen from China Mainland, these products are likely to be damaged in the course of use if not detected. At the same time, there are many interference factors such as pulse group, lightning surge interference, voltage dip and so on. If there is no CE certification, the equipment is likely to be damaged and can’t be used normally.

3. Current forms of CE certification in China mainland

At present, there are three kinds of domestic CE certification as following:

A：Only certified certificate, no test report:
This type of certificate is almost invalid and cannot be queried on the appropriate website. Products with this certification mark can’t be recognized as ticket to the European market. Products with this kind of certificate is equivalent to the product without CE mark, and they should be detained or even returned.

B: Certificate of compliance / Certificate of compliance, with test report:
This type of certificate is issued as a statement of conformity by the third party Agency (agency or test certification body). The test reports and other technical documents TCF should be enclosed by this kind of certificate. At the same time, enterprises also have to sign the<declaration of conformity>. This type of certification report is only recognized in mainland China. Although there are the test report and related certificates according to the requirement, the relevant information can only be checked on the detection of the company’s own website. But many such testing company themself do not comply with EU certification requirements. The certificate is only applicable to the manufacturer for product quality self inspection, there is also a greater risk of being detained by the customs ana cause fines and delivery delays. This will affect the normal use of products. This kind f certificate is shown in the following figure :



C: EC Attestation of conformity < EU standard compliance certificate >
This type of certificate is issued by the EU notified body (Notified Body known as NB). According to EU regulations, only the NB are eligible to issue EC Type CE Declaration.

This type of certificate and test report are issued by testing organization certified by EU. The products finish the complete testing during the certification process and has a complete test report. Meanwhile, certificate No. can be found in the appropriate Website. Only these electronic equipment which has finished the testing and certification can be exported to EU and can get CE label. All of Lisun series devices do CE certification in such bodies certified by European Union, and has integrated <EU standard compliance certificate> and corresponding test report. Certificate template is shown in the following figure:



Lisun is lead in designing and producing high quality, high precision, high performance products to Europe and customers from all over the world. Lisun applied the first CE certification at the beginning of entering the European market and provide long-term excellent quality services for European customers. When the CE certificate expires, Lisun immediately contact the top certification bodies to do.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Spectroradiometer, Integrating Sphere, LED Test Instruments, CFL Test Instruments, Photometer and Colorimeter, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, IP Waterproof Test Equipment, Dustproof Test Chamber, High and Low temperature Humidity Chamber, Plug and Switch Testing, AC and DC Power Supply.


Please feel free to contact us if you need any support.

Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618917996096