Lm70 And LM80

Certification of durability, depreciation of the luminous flux.

The useful life of the LED can be evaluated as a catastrophic failure (simply crashes) or for loss of luminous flux over time. More precisely, we usually assess the lifetime of LEDs by luminous flux maintenance after a certain period.

According to ASSIST (Alliance for solid-state Illumination Systems and Techologies) the human eye begins to realize the change of light intensity after the depreciation hit 30% of initial value.

The representation used L70 defines that the useful life of the luminaire ends when it reaches 70% of initial luminous flux after a given number of hours. For example, L70 50Kh, means that the life of the lamp is 50,000 hours to 70% of initial luminous flux maintenance. Following the logic L80 means 80%, but only excellence equipment will indicate this feature, because it is very strict.

We left as a tip, do a calculation in hiperdimensionado 30% lighting, to ensure the stability of the system, whereas regardless of technology, all detracted from lighting systems. Is a safety coeficiênte always welcome!

Note in the graph that even after the depreciation of luminous flux in 70% in X hours, until the led comes on catastrophic failure will take X hours. The logic is that the replacement prior to catastrophic failure, considering all the ramifications that a luminous flux depreciated can bring to the environment.

Gallery

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