
Progress in Understanding Color Maintenance in Solid-State Lighting Systems
Maryam Yazdan Mehr, Willem Dirk van Driel, G. Q. (Kouchi) Zhang
Engineering ›› 2015, Vol. 1 ›› Issue (2) : 170-178.
Progress in Understanding Color Maintenance in Solid-State Lighting Systems
In this paper, progresses of color maintenance, also known as color shift, in solid-state lighting (SSL) systems are thoroughly reviewed. First, color shift is introduced and a few examples are given from different real-life industrial conditions. Different degradation mechanisms in different parts of the system are also explained. Different materials used as lenses/encapsulants in light-emitting diode (LED)-based products are introduced and their contributions to color shift are discussed. Efforts put into standardization, characterizing, and predicting lumen maintenance are also briefly reviewed in this paper.
light-emitting diode (LED) / color shift / lumen depreciation / lumen degradation
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