Why should LED test ohms?
Some companies produce LEDs, but there is no test ohms. Only test current and voltage. Of course, according to these two parameters, the static ohms at this time can also be calculated. The formula is: I=U/R.
What is the reason?
It can be used to express the volt-ampere curve of the LED, that is, the curve of voltage and current. The ordinary linear resistance is generally a straight line, but the LED is a diode characteristic, so the straight line is not a rising curve, and the LED ohmic change is also indicated.
What does the LED ohmic value affect the LED?
Different ohms of different LEDs will affect the power consumption of LEDs. In the case of the same ohmic LED, the low power is generally 20MA, the high power is generally 350MA, and the voltage is relatively large, such as a 3.2V, one is 3.4V, power P = UI, power consumption is large, if you want LED lighting to save more power, you must choose a small ohm, that is, the LED with a small voltage at the same current.
What is the range of ohmic values ​​for general LED lamps?
Look at the different LEDs, R = U / I, you can calculate by yourself, the low-power 0.06W straw hat white light is generally 20MA, the high power 1W is generally 350MA, the voltage is generally 3.2V, so the former is 160 ohms, the latter 1W It is about 9.14 ohms, but as the LED illuminates, this resistance will decrease. Under the constant current supply of the LED, the operating voltage will drop.
LED lamp reliability test method
Place the LED fixture in a -15 ° C environment;
Test method: After the lighting test, the light is controlled by the relay to perform the impact test in this environment;
The test settings are: lighting for 20s, turning off the lights for 20s, and cycling for 100 times;
Target: LED lighting (finished lamps with led driver) test requirements.
The test box is kept at high temperature and low temperature for 0.5 h and cycled 8 times;
Test requirements: reference standard: industry experience, power on, lighting 24h, and observe whether the lamp is damaged, the material is deformed by heat and other abnormal phenomena;
Target: LED lamps (finished lamps with led driver),
The temperature range of the test box is set from -10 ° C to 50 ° C, and the temperature shift rate is: greater than 1 ° C / min, but less than 5 ° C / min.
Packing the led lamp sample on the vibration test bench;
After the low temperature and low pressure test, the lamp can not be exposed to paint, discoloration, cracking, material deformation and other abnormal phenomena;
Target: LED luminaire (finished lamps with led driver) led luminaire test method,
High temperature and high pressure and its impact test: Target: LED lamps (finished lamps with led driver) Test requirements: Reference standard: industry experience.
Turn on the power, turn on the lights for 24h, and observe whether the lamps are damaged or the materials are deformed by heat; the reference standard: industry experience for the object: led lamps (finished lamps with led driver),
After the sample is taken out, the surface water droplets are wiped off, and after 2 hours of normal atmospheric pressure and normal temperature, the inspection is performed;
After the high temperature and high pressure test, the luminaire can not have abnormal phenomena such as surface paint stripping, discoloration, cracking and material deformation;
After the lighting test, the impact test is carried out in this environment by the relay control lamp. The test setting is: lighting for 20s, extinguishing for 20s, and cycling for 100 times. Test method: After the temperature cycle test, the lamp can not be electrically anomalous such as leakage or lighting.
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