| 摘要 |
A transparent lighting diffuser panel is provided for circular gas discharge lamps and having an inner surface, facing the lamp, comprising a generally cylindrical toroidal fresnel lens with the optical centerline of the lens approximately equal to the lamp circle diameter and coaxial with the center of revolution of the lamp tube; and an outer surface, facing away from the lamp, comprising an overall pattern of elongated linear triangular prisms in a radial pattern coaxial with the toroidal lens and the lamp.
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