LM-79 Testing Laboratory

Monday 13 February 2017

LED is becoming so popular that it has replaced all other lightning sources like candescent lamp, CFL. Manufacturer have shifted to produce LED and making profits by selling low quality products in the market. This can deteriorate the LED business. LM 79 helps to access the LED by giving the photometric parameters and electrical parameters.
LM 79 focus on the absolute photometry, so it directly measures the total lumen of the complete lightning system including fixture, driver etc. LM 79 test report gives electrical and photometric parameter.
Photometric parameter: Luminous flux (lm), efficacy (lm/w), Luminous intensity distribution (candela), chromaticity coordinates, correlated color temperature (CCT), color rendering index (CRI)
Electrical parameter: voltage, current, frequency, power, power factor.
LM 79 Data enable objective product comparison and allows for evaluation relative to performance requirement.

Tuesday 7 February 2017

As we all know about the strength of LM 79. Everything has its pros and cons. Let us have a look on the drawbacks of LM 79.

LM 79 depicts the parameters of the individual products. So the obtained Parameters cannot be used to access alike products.
Other limitation is the sample size. It does not state any sample size. So, the manufacturer provides only one sample instead of supplying more. This thus increases the vulnerability of lesser quality products.
This can be used only to determine complete luminary instead of LED used ( as based on absolute photometry) , which can produce different results due to quality of accessories used like glass, thermal effect, lenses etc.