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The lighting effects industry presently does not have a standard meaning for Light-emitting Diode lamp life (Narendren et al. 2001a). The lamp life meaning for old-fashioned light resources may be the time from which 50% of this test samples have burned out (Rea 2000). LEDs generally don't fail by burning completely but will gradually lower in light output as time passes; as solid-state devices they will continue to run even with 100, 000 hours, continuing to use electrical energy even though they create very little useful light. An assessment of near the end of rated life for conventional light sources (e.g., incandescent, fluorescent, high intensity release) (Figure 11) shows that apart from material halide lights, these lights often have at least 80% of their initial light output once they will have managed 10, 000 hours. Moreover, even when light degree reductions happen over a few minutes, men and women will not notice all of them before light level reaches 80percent of the initial value (Kryszczuk and Boyce 2002). Therefore, it could be proper to take into account this criterion as a basis for "useful" life for Light-emitting Diode sources utilized in general lighting.

Figure 11. Lumen maintenance curves for various light resources out to 10, 000 hours.

Indicator-type white LEDs that have been available on the market as recently as 2000 and 2001 reach 80% light output within 1000 to 2000 hours when operated at rated current in laboratory conditions (Figure 11) (Narendran et al. 2000a, 2001b). The high degradation rate in these LEDs is especially as a result of yellowing associated with obvious epoxy material due to high temperature into the factor. Newer, high-power, white LEDs have actually enhanced lumen upkeep, therefore could have much longer lamp life (higher than 25, 000 hours). Present measurements by the Lighting analysis Center show why these devices maintain their light output for dramatically longer times than indicator-type LEDs making use of earlier technology (Narendran and Deng 2002a). This is certainly mainly due to improved thermal administration and qualities.

Source: www.lrc.rpi.edu
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