FIELD: optics.
SUBSTANCE: invention relates to a lens cover for illuminating a growing room in a closed ground. Lens cover comprises a base substrate and an optical lens element. Optical lens element extends from the base substrate and defines a focal centre. Optical lens element has a length and a width and comprises an outer surface and an inner surface. Outer surface extends from the base substrate along the outer perimeter and is symmetrical about the focal centre. Inner surface is symmetrical about the focal centre.
EFFECT: high optical quality of light-emitting diodes.
19 cl, 15 dwg
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