| 摘要 |
A light comprising an LED whose light intensity decreases as the angle from an axis of the LED increases, and a convex lens associated with the LED such that a beam width of the LED is concentrated by the lens into a narrower beam width, wherein the convex lens includes both a convex surface and a concave surface, and the concave surface is curved more sharply towards its edge than towards its center such that light is more evenly spread across the beam width of the lens.
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