| 摘要 |
A high efficiency, broad beam lighting device 30 having a converging lens 1 having a curved focal line 26. A source of light comprising a plurality 9 of ceramic LED lamps disposed in an equiangular array having their apparent emission line between minimum divergence curved line 37 and interior surface 27 of converging lens 1 on broad beam curved line 39 such that each LED has its emitted light concentrated by lens 1 into an elongated light beam comprising a central zone substantially surrounded by a peripheral zone. Converging lens 1 further concentrates the light emitted by plurality 9 of LED lamps into a composite elongated light beam having a broad vertical beam spread and concurrently increasing the intensity at the location of the central zone of the elongated light beam of each LED by adding to that central zone location light from the elongated light beam of at least one adjacent LED.
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