Friday 9 May 2014

What is the advantage of a "straw hat" (inverted cone) LED?



LEDs with a concave cone-shaped lens are sometimes called "straw hat" LEDs. What is the advantage compared to the more common hemispherical lens?


An example of this type of LED



Answer



The straw hat LED lenses have a much more even light distribution pattern than the typical hemisphere lens. The hemisphere lens usually focus the light into a narrow cone of maybe 20 or so degrees. One application that workes very well is Christmas tree lights. The straw hat lenses make the LED disperse light like an incandescent bulb.


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