FIELD: lighting.
SUBSTANCE: invention relates to lighting engineering. Optical unit includes outer lens (50) and inner lens (40) located inside outer lens (50). End cover (30) is connected with main housing (12) of lighting device and is configured to allow light from light source (18) in the main housing (12) to enter the end cover (30) and then pass to outer space through inner lens (40) and outer lens (50).
EFFECT: high efficiency of light output at the ends of lighting device.
19 cl, 6 dwg
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