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If anyone wants to dive into physics behind the reasons why you can't efficiently collimate light from a large emitter like a LED array, this Stack Exchange ans
by avian 6y ago
If anyone wants to dive into physics behind the reasons why you can't efficiently collimate light from a large emitter like a LED array, this Stack Exchange answer [1] and the Wikipedia article about etendue [2] is a good start.
[1] https://physics.stackexchange.com/a/91536 https://physics.stackexchange.com/a/91536
[2] https://en.wikipedia.org/wiki/Etendue https://en.wikipedia.org/wiki/Etendue
- ramses0 6y agoThere was a very interesting article about how you can't focus 100's of magnifying glasses using light from the moon to start a fire, probably similar in principles? XKCD explainer here: https://what-if.xkcd.com/145/ https://what-if.xkcd.com/145/