How to Disable Digital Driver Signature Enforcement for 64bit WIN 7 8 10?

If the driver need be installed in 64 bit Windows System, it need have digital signature. While some driver don’t have digital signature and the PC can’t install this kinds of device. If you want to install this device in 64 bit Windows System, You need disable digital signature enforcement.

Our some equipments need disable signature enforcement, such as LMS-6000, LMS-7000 and LMS-9000 series spectroradiometer.

For Win 7 system

1.For the 64 bit WIN7, We have a small program in the CD, like the picture below. We can disable digital signature by the CD.



2.The program named as below. Double click it.



3.Then click ‘Next’



4.Click ‘Yes’



5.Click ‘Enable Test Mode’ and go ‘Next’



6.Click’确定’



7.Click‘Exit’



8.Restart the PC and removed the signature successfully

For Win8 and Win10 System

1.For the 64 bit WIN8 & WIN10. We can disable the digital signature on the PC directly. First hold down ‘Shift’ key.



2. Click ‘Restart’ as below picture.



3.Click‘Troubleshoot’



4.Enter ‘Advanced options’



5.Enter ‘Startup Settings’



6.Click ‘Restart’



7.Press ‘F7’




NOTE: There is another way to enter "Troubleshoot".

1. Click "All Settings"



2. Click"Update & Security"



3. Click "Restart now"



You can also watch the complete video as below



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

GDJS/GDJW High and Low Temperature Humidity Chamber is Designed According to IEC 60068-2-1 Environmental Testing Part 2-1: Tests-Test A: Cold

The full name of IEC 60068-2-1 is Environmental Testing Part 2-1: Tests-Test A: Cold. It is edited by the IEC technical committee in 2008.We will introduce the IEC 60068-2-1 Environmental Testing Part 2-1: Tests-Test A: Cold

The following is the original content of IEC 60068-2-1

IEC 60068-2-1 Environmental Testing Part 2-1: Tests-Test A: Cold

This part of IEC 60068 deal with cold tests applicalbe to both non heat-dissipating and heat-dissipating specimens. For non heat-dissipating specimens, Tests Ab do not deviate essentially from earlier issues. Test Ae has been added primarily for testing equipment that requires being operational throughout the test, including the conditioning periods.

The object of the cold test is limited to the determination of the ability of components, equioment or other articles to be used, transported or stored at low temperature.

Cold tests cover by this standard do not enable the ability of specimens to withstand or operate during the temperature variations to be assessed. In this case, it would be necessary to use IEC 60068-2-14.

The cold tests are subdivided as follows:

- Cold tests for non heat-dissipating specimens
. with gradual change of temperature, Ab;

- Cold test for heat-dissipating specimens
. with gradual change of temperature, Ad,
. with gradual change of temperature, specimen powered throughout, Ae.

The procedures given is this standard are normally intended for specimens that achieve temperature stability during the performance of the test procedure.

LISUN designed the GDJS/GDJW High and Low Temperature Humidity Chamber according to the IEC 60068-2-1 standard. It is used to test the CFL/LED which meets IES LM-80-08, electricity products, electronic components, material and so on. We will update the procedure and testing parameters according to the updating of the IEC 60068 standard.

The following is the picture GDJS/GDJW High and Low Temperature Humidity Chamber


    
The following is the video of GDJS/GDJW High and Low Temperature Humidity Chamber



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

Equivalent Test Between Normal & High Frequency Fluorescent Lamp and LED Tube

Comparing with traditional fluorescent lamp, the LED tube have high light effects, low power consume, long life time and stable luminous efficiency advantages etc. At the same time, for the LED tube performance testing is became more simple, in recent years more and more customers has chosen the LED tube to replace fluorescent lamp.

Due to the main lighting products are consist of traditional fluorescent lamp, like the CFL and fluorescent lamp are still occupy a large part of market, it’s impossible to replace all of them immediately, specially at the business centre and market still have many fluorescent lamps and compacted lighting products; if replace all fluorescent lamp to LED tube, it’s need lots of tome and huge cost, the most important is this way can’t be approved. In order to make replacement work more effective, the IEC issued the IEC 62776 standard dated December of 2014, this standard explain how to do equivalent test between normal & high frequency fluorescent lamp and LED tube. Before large scale replace fluorescent lamp to LED tube, we have to make sure the LED tube whether can turn on and meet lighting demand, the lighting demand have two points: the first is require the LED tube have lower power consume than fluorescent lamp; the second is based on consume same power, the LED tube have to higher light effects than fluorescent lamp, so we will discuss the comparison test between fluorescent lamp and LED tube. The below is IEC62776 standard and equivalent test explanation:

The IEC 62776 standard from chapter 1 to chapter 3.2 are mentioned the LED tube can replace the double-capped fluorescent and how to use G5 and G13 lamp holder fluorescent lamp turn to LED tube, this kind of equivalent replacement needn’t LED tube to do any change, this standard only talk about G5 and G13 lamp holder of LED tube(1 Scope). At the same time, this standard also mentioned the IEC 60081 double-capped fluorescent lamp performance test and LED tube suitable replace fluorescent lamp with integrated magnetic ballasts. How to do equivalent test between LED tube and fluorescent lamp, there will be use a high frequency power supply and high frequency adjustable reference ballast. As we knew the fluorescent lamp is consist of fluorescent capillary, electrical ballast and fixture, the IEC 60081 and IEC 60901 both standards have clear explanation for how to testing fluorescent capillary. The testing process is connect RB-3 adjustable resistance ballast with double-capped of fluorescent capillary, also we need connect HFP-800 high frequency power supply with double-capped of fluorescent capillary, some of fluorescent capillary need to do preheating process according to IEC standard’s requirement, as below picture. At the same time, the relevant parameters need set up according to IEC standard’s requirement.




Click to learn more details on How to Measure the High Frequency Fluorescent Lamp. For the equivalent test between fluorescent lamp and LED tube, actually, it’s take away the fluorescent capillary and connect LED tube(included driver) with EB, it’s have necessary to explain the working principle of EB and driver: the EB is AC to AC model, when turn on the fluorescent lamp, there have a AC model high voltage to electric shock fluorescent capillary for lighting lamp, then the EB will output constant AC voltage to maintain the fluorescent lamp is always lighting on; the LED driver is AC to DC model, there have a DC power to lighting on singled LED or LED luminaires. So there use a LED tube(included driver) connect with EB which also keep AC to AC model, the equivalent test have three purposes: One is lighting on LED tube; Second is see whether the power consume of LED tube is lower than fluorescent lamp or not; third is light effect of LED tube is higher than fluorescent lamp(this will be judge by spectrometer & integrating sphere system). If need use best fair way to assess these three purpose, the EB is important, we can’t use any of EB to do this kind of equivalent test, this EB must be mentioned or recommend by IEC or other standards, to solve this issue, Shanghai Lisun Electronic office developed HFP-800 High Frequency Power Supply and RB-3 High Frequency Adjustable Reference Ballast, both device are fully meet IEC60081 IEC60901 and ANSI C78.81 & C82.11standards. As we know the reference ballast is special designed for select reference light(fluorescent capillary), the characteristics of reference ballast have constant voltage and current ratio based on rated frequency, and it couldn’t have any affected by voltage, temperature and ambient changes. The RB-3 is application with no sense of resistance ballast, the HFP-800 provide high frequency reference ballast with pure and high frequency power supply. The HFP-800+RB-3 system not only can to do T5/T8 fluorescent lamp test, but also can to do LED tube equivalent test.

Finally, we can see the difference of fluorescent lamp test and LED tube equivalent test. According to standard’s requirement, for the fluorescent lamp test, there must use relevant device, set up preheat current and preheat time to lighting on fluorescent lamp(As picture 1 show). Due to LED tube is special, when to do connection, we needn’t this device(As picture 2 show):



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

IEC 60529（GB4208-2008）IP Protection Grade Waterproof and Dustproof test

IEC 60529 IP code is a coding system to indicate the degrees of protection provided by an enclosure against access to hazardous parts, ingress of solid foreign objects, ingress of water and to give additional information in connection with such protection IP code includes 4 digits, like IP23CH. IP short for ingress protection; numeral 2 stands for first characteristics and can be instead by numerals 0 to 6 or letter X (not requires to specified), it indicates enclosure against ingress of solid foreign; Numeral 3 standards for second characteristics and can be instead by numerals 0 to 8 or letter X (not requires to specified), it indicates enclosure against ingress of water with harmful effects. Letter C is additional letter, indicates enclosures access to hazardous parts, can be instead by letters A, B, C and D, but this characteristic can be ignored; Letter H is supplementary letter, can be instead by letters H, M, S and W, but this characteristic can be ignored. In this article, we just discuss the first and second characteristics.



The first characteristic can mark with numerals 0 to 6. We temporally ignore the second characteristic, additional letter and supplementary letter, i.e. IP0X to IP6X. According to IEC60529, it describes as: IP0X——non protected; IP1X——≥50mm diameter; IP2X——≥12.5mm diameter; IP3X——≥2.5mm diameter; IP4X——＞1.0mm diameter; IP5X——dust protected; IP6X——dust tight.

There are many standards refer to IEC60529 regarding dustproof test, like IEC60598 luminaires general requirements and tests, clause 2.3 mentioned to classified the luminaire according to degree of protection against ingress of dust, solid objects and moisture; GB2423.37-89 electric and electronic products basic environmental testing procedure mentioned that sand and dust test method; GB/T4942.2-93 protection grade for low voltage device shell; GB7000.1 and GB7001 luminaire general requirements and test standard mentioned that the luminaire only need to do the test for IP5X and IP6X.

LISUN SC series dustproof testing machine is for IP5X and IP6X test.

SC 015_Dustproof Testing Machine



The second characteristic can mark with numeral 0 to 8. We temporally ignore the first characteristic, additional letter and supplementary letter, i.e. IPX1 to IPX8. According to IEC60529, it describes as: IPX0 non protected; IPX1——vertically dripping; IPX2——dripping (15°tilted); IPX3——spraying; IPX4——splashing; IPX5——jetting; IPX6——powerful jetting; IPX7——temporary immersion; IPX8——continuous immersion. The applied water requests clean water. According to the standard, drip box is for IPX1 and IPX2 test; Oscillating tube or spray nozzle is for IPX3 and IPX4 test, the semi-diameter of oscillating tube has 8 solutions for optional according to the size of the sample, the minimum is 200mm, the maximum is 1600mm, and increase step is 200mm. But quantity of the holes is difference for each grade. For example, there are 8 holes in semi-diameter 200mm tube for IPX3, but for IPX4, there are 12 holes in semi-diameter 200mm tube. Water jet hose nozzle is for IPX5 and IPX6 test, but difference grade, the inner diameter of nozzle is different, the inner diameter of nozzle is 6.3mm for IPX5, and 12.5mm is for IPX6, the distance from nozzle to enclosure is 2.5m to 3m. Immersion tank is for IPX7 and IPX8 test, the test time is 30min for IPX7.

LISUN JL-X series is for IPX1 to IPX8 test.



There are also many standards refer to IEC60529 regarding dustproof test, like IEC60598 luminaires general requirements and tests mentioned to classify the luminaire according to the degree of protection against ingress of water; IEC60335 house holding and similar electrical appliance general requirements and  IEC60034-5:2000 degrees of protection provided by the integral design of rotating electrical machines mentioned the waterproof test.

In practice, it is a big problem for electronic equipments, luminaire, and house holding manufactures to find the right products to do the waterproof and dustproof test. Lisun Group developed the SC-X series dustproof test chamber and JL-X series waterproof test equipment according to IEC60529. SC-X dustproof test chamber is for IP5X and IP6X test, there are several models for optional according to the sample size.

JL-X is for IPX1 to IPX8 test, there are four equipments for optional, JL-12 drip box is for IPX1 and IPX2 test; JL-34 swing pipe water spray test equipment is or IPX3 and IPX4 test; JL-56 waterproof jet test device is for IPX5 and IPX6 test; JL-78 immersion tank is for IPX7 and IPX8 test.

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

LISUN 3M Integrating Sphere Test Results Comparison

Lisun engineers visited Barcelona recently, this visit was mainly to install the 3m Integrating Sphere Test System for the customer and provide training service.

This customer compared the test results of Lisun’s 3m Integrating Sphere Test System with the test results of Holophane(HEL) and LIA Laboratories. This customer provided 4 samples to the third lab. Compared with LIA Laboratories, our tolerance are controlled within 5%:

HAL – LED Highbay: 4.6%

VMX LED Luminarie: 2.3%

Corn Lamp: 2.5%

Platek – Target Medium Prioette LED Luminaries: 0.5%


The test report of Platek tested by Lisun 3m Integrating Sphere Test System


The test report of Platek tested by LIA Laboratories-1


The test report of Platek tested by LIA Laboratories-2

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 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