FIELD: physics.
SUBSTANCE: invention provides an illumination device 100, having a translucent exit window 200, one or more transmitting windows 300, arranged after one or more LEDs and before the translucent exit window 200, and one or more luminescent material layers 400, which may particularly be applied to the downstream and upstream surfaces of the transmitting windows 300.
EFFECT: simple process of applying layers of luminescent material and stabilising optical properties of device.
15 cl, 15 dwg
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