As we all know, LED light attenuation is the light weakens during
transmission, the quality of LED dimmable driver made by each companies is
different, there are light decay also for high-power LED dimmable driver, and
it’s have direct relationship with temperature, in fact, mainly depend on the
chip, phosphor and packaging technology. The LED luminosity attenuation
(including luminous flux attenuation, color change, etc.), is a measure standard
of the LED dimmable driver quality, also it is great concern to many LED
dimmable driver manufacturers and LED dimmable driver user.
According to the lifespan definition for the LED dimmable driver of the LED
industry, the lifetime of LED dimmable driver is the cumulative work time from
initial value till light fades to 50% of the original value. This means that the
LED still bright when LED dimmable driver achieves its end life time. However,
in illumination the light is not allowed if the light output attenuation on its
50%. Typically, indoor lighting the light decay can not greater than 20%,
outdoor lighting fades is not allowed greater than 30%.
At present, the white LED light attenuation is one of the most important
issues for it’s enter the civilian lighting market. And manufacturers generally
tested attenuation in three ways:
a. Visual method: continuously lit LED dimmable driver, observe the
brightness and color changes by human eyes.
b. Use light color testing instrument: that during continuously lit LED
process, take the LED dimmable driver into the light color test instrument
frequently, and record test results, and report test results by EXCEL or other
tools.
c. Use professional testing instruments to measure the light fades, that is
put the LED dimmable driver in the test equipment, during the continuously lit,
the system will have real-time tracking for the LED brightness and color change,
automatically generate information sheet.
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