It does not appear that the LEDs are in an optimal position of focus - each parabolic section does not seem “deep” enough. He seems to have the bottom of the LED on the focal point, not the LES. That said, there’s only one beamshot in the link and it’s pointed at a stand of trees, but I don’t see anything objectionable with it…
Well, the thread title is Intersting Optics Thread, not beautiful beamshots against white wall… But I’ll reserve judgment until I see what something like the Illumivation light does….
LOL yes should have inserted an emoji there. But that’s a home made thing. I would like to see the beam pattern of the Illumivation light and how it compares to the multi-reflector lights. I would think with the emitters a lot closer together it would minimize the petaling effect I’ve seen with multi-reflector lights.
you’ve been watching the you tube vids haven’t you?
whats worse than useless? an uboxing,
whats even worse than unboxing vids?
a mirrion candella flashlight beam on a house wall at ‘’wow that’s a good 30 feet away’’….or even…du dahhhhh 5 feet in the the airing cupboard lol. we need yards not feet, hundreds of them lol.
ok…if you just want to see the shape a 5 foot away wall will show the spill and spot………in a 5 foot room no less lol. my head hurts.
Looks like they’ve been defunct for a few years now. Doesn’t look like they ever brought these to the market, they look more research-oriented.
But this is interesting too - I’ve seen this (middle) style before, I assumed its purpose was to produce a floody beam, but no:
And that last lens is indeed interesting. Though it sacrifices some frontal area. And need a windown in the front to get waterproofing (which reduces efficiency by enother 1% or so). Too bad the paper doesn’t describe it better….
For example:
LL01CR-CTKxxL02-P is 49.5 x 7.8 mm designed to produce narrow (10 degree) beam with 3535 LEDs. Can’t find a datasheet for it though.
21700 thrower with 52 mm head and 100 mm length?
Or V-Cut LL01CR-DAWxxL52, smooth beam thrower lens (how does it compare to OP?), 45 x 10.85 mm.
You can have a look at the LPI patents if you want the gory details. Or this, it’s a bit easier to read. I have also found their book “Nonimaging Optics”, very interesting but so complex that I can’t even scratch the surface.
Looks like these things were a bit of a byproduct of researching solar concentrators for multi-junction cells.
I’ve always been partial to Ledil lenses since they had numerous choices for 35mm optics for single or multiple LEDs. The Cute-3 S and GT4-XP-S paired nicely with 32mm triple and quad mcocb’s.
I intended to write about Fresnelized TIRs for a while…
A simple TIR lens guides light on 2 paths:
The light emitted forward is refracted as it enters the lens and again as it leaves it.
The light emitted sideways is refracted, TIR-reflected and refracted again.
It is possible to fold one or more surfaces to reduce height. Some call this TIR-R, some Fresnel-TIRs.