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.
Louie, not sure if that’s interesting for you but there’s also Ledil Stella - a silicone lens family for 30 mm LES. Over 30 mm I also see only reflectors.
Interesting diffuser in a small Verbatim bulb. This sits on a small Cree CXA COB. Old & inefficient (65lm/W), but it was only 1.40 so I bought it.
I’ll have to take pictures but it’s a very nice and even “beam”. Now if there’s a way to fit something like this on top of a 1” flashlight…
This is one of the biggest TIRs, 75mm
It’s only been tested with COBs up to 23mm but the LED opening seems much bigger than that.
Only problem is that when using a TIR with a large LES LED then the angle of incidence varies a lot, which may cause light leakage since total internal reflection only works at large incidence angles.