LIGHTING DEVICE Russian patent published in 2015 - IPC H01L33/50 

FIELD: lighting.

SUBSTANCE: invention relates to the lighting device containing a material (2) for the initial light (4) conversion to the secondary light (5), at that the material (2) for conversion contains the converting photoluminescence material (15), that degrades to non-conversion photoluminescence material within time when the material (2) for conversion is lighted by the initial light (4). Material (2) for conversion is adapted such that when the material (2) for conversion is lighted by the initial light (4), the relative concentration decreasing of the conversion photoluminescence material (15) in the material (2) for conversion is higher then relative decreasing of the secondary light (5) intensity.

EFFECT: invention provides the lighting device with the ability to ensure slightly reduced absorbing capacity for the initial light even if major part of the photoluminescence material discolored, and hence more long service life under the same or slightly reduced intensity of the secondary light.

15 cl, 18 dwg