Interesting optics thread

If you use math instead of rules of thumb then you can determine the performance without even physically having the components.

it depends on who’s maths. i.e. the punter maths v the real maths. google really isnt your friend lol.

edit, that wasn’t a poke at you btw. more of a sometimes you have to try even if its against the thermal laws of dynamics.(which btw is only one set of maths, and contrary to belief is not the only holy grail of truth.).

I’m not sure if I understand the setup correctly…
Is is something like this ?

I’m thinking so…

Yes, it has multiple parabola sections each with their focal point for one of the LEDs.
Basically same throw as a normal single parabola+single LED config but with more lumens.
Harder to cool the LEDs though since they stick out forward, kinda like car LED headlight bulbs.

In theory yes, but McGizmo’s beamshots looked very bad which makes me sceptical about such construction.

It’s not easy to make a shape like that.
It’s hard enough making a proper parabola for most manufacturers.

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…

I divide lights into 2 classes. Those where I want spill and those where I don’t.
If I want spill - it should have useful shape.

This reflector doesn’t fall into either class.

Yet another RXI optics from LPI, 25 mm this time:

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….

I never said it was not interesting. :wink: I sure think it is.
Just that what I’ve seen doesn’t inspire my confidence that I’d like this one.

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:


I see a russian shop hosts their datasheet:

The item doesn’t seem to be available in the shop though. So maybe they hit the market at some point…

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….

Here

Wow, thanks for the link.

I remember seeing LL datasheets before but never got interested in their lenses. But they seem to have many ultra-compact lenses available:
https://www.ledlink-optics.com/wp-content/uploads/2018/05/2018-Commercial-Lighting.pdf

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.

Looking for a source for lens type optics for large COBs (over 22mm dia. LES). Aside from reflectors, everything I see is for 19mm and under.