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Do LED TIR lenses work with white LED or do the colors all come out at different angles

Do LED TIR lenses work with white LED or do the colors all come out at different angles 

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May 11, 2020 07:53

In a TIL lens, the initial entry to the lens from the source, and eventual exit from the lens to the destination, are subject to wavelength-dependent angular effects, since they still involve refraction, but the internal reflections do not. If the internal reflection paths allow more of the entry and exit transitions to occur closer to perpendicular to the lens at points of entry and exit, the overall aberration could be lower than a conventional lens.
(The question to ask isn't whether there is any aberration, but whether the aberration is enough to interfere with the intended usage.)
@Boss, here is a paper on using a TIR lens with RGB LED:
https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.823.1825&rep=rep1&type=pdf

This also brought to mind an announcement from last year, about a lens design that solves the chromatic aberration problem:
https://petapixel.com/2019/07/05/goodbye-aberration-physicist-solves-2000-year-old-optical-problem/

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May 6, 2020 07:46

That is a really interesting question and one I had not considered previously. I think you are correct having considered their operation and would also like to know the answer.
I did find this https://uk.rs-online.com/web/p/led-lenses/8892245/ which is designed as a reflective lens and combine the colours, so as this exists I think TIR lenses will not combine colours of RGBW type LEDs.

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