Ancestors

Toot

Written by 🏳️‍🌈Real-Time on 2024-10-11 at 00:38

Can I make this at home?

Is there any inherent reason it cant be square with corners so I can use chrome tape

I guess I need to learn some new math

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Descendants

Written by 🏳️‍🌈Real-Time on 2024-10-11 at 00:40

For the curious it's a parabolic reflector for standard 100w COB LEDs

It's apparently made of Vacuum coated polycarbonate

how reflective are chrome spray paints?

should I 3d print it and try to plate it?

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Written by Z̈oé ⛵ on 2024-10-11 at 00:44

@realtime silver mirror isn’t too hard to do (you’ll need silver nitrate, ammonia, sugar) but it needs a polished, degreased surface to start with, and if you don’t coat it with a clear lacquer it will dull in a year or 5

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Written by Rue Mohr on 2024-10-11 at 02:29

@realtime I wonder what that would look like if matematically adjusted....

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Written by 🏳️‍🌈Real-Time on 2024-10-12 at 00:11

@RueNahcMohr I wouldn't know where to start on the math. I assume "parabolic" means that this is just a y=x^2 with a revolution applied but I'm not sure what the terms are, how to determine focal length, etc.

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Written by Rue Mohr on 2024-10-12 at 00:39

@realtime look at it as ray tracing, but go backwards. take a parallel beam coming in and find the required surface angle to make that ray hit the LED. play with the positions but keep that angle right.

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