Your question is not very clear, but if I under stood it correctly you can’t put any kind of TIR under the 10158 catadioptric.
The 10158 has a small opening in the bottom that fits an LED, it is not like a lens where light goes through the whole thing.
Light enters it from a small hole and then it gets reflected/refracted forwards.
If you put the 10158 under an aspheric lens it will make a large ugly looking circle on the wall as the lens projects the front image of the 10158 which is hundreds of times bigger than an LED die.
Fraen makes a cool optic for COBs; nested multi TIR which supposedly reduces spill. Would be great if they made them for COBs larger than 22mm.
I do have these cool hybrid reflectors from Auer, and aside from working well, are quite beautiful to look at in person:
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I thought it used TIR and not metallization. Thanks for setting me straight.
So…it’s the best documented lens of this type and is clearly a poor performer.
I thought it used TIR and not metallization. Thanks for setting me straight.
So…it’s the best documented lens of this type and is clearly a poor performer.
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It does use TIR but not in the conventional way. The light rays bounce off the top lens surface. The area in the center where the angle of incidence is too great for the TIR effect gets a reflective coating.
I think it works well, though as you could probably imagine it works better for certain emitters…. STO uses a similar if not the same lens on one of their lights.
Here’s a very interesting LED/compound parabolic reflector setup! I think this would be a cool setup for a handheld; if you wanted a good mix of spill and throw… Can’t find a pic of the beam however.
car headlights, they used to have ‘fresnal’ type patterning, but it wasn’t to aid the overall throw, it was to even out the beam to get rid of dark rings and likes, or to ‘widen’ the beam, in eather case it makes the lens brighter to look at and reduces the overall throw. (bare in mind the tail end of throw is a pitiful amount, even if it reach’s the moon you wouldn’t notice it, so it would be better spent being spread into the usable beam).
the one thing i have noticed about focusing lenses is they do turn into a cinema projection, but mostly they cut out the spill, i’ve only played with a dozen or so torch’s but the one thing that was blattent was theres more throw with unlensed, e.g. i got a couple ‘throwers’ with massive focussing lenses on, now whilst i was actually impressed by the apparent throw, an el cheepo bike light with an old T-6 in it out threw them all, all be it with half a field worth of side spill. (no magnifying, just a standard non coated crappy face plate lens).
to further my thinking, i have a red led with a focusing lens i used for wild life, simply because there is next to zero side spill, quite literally a tight square led projection arriving un announced at the other end…but, again, the el cheepo dish out throws it with heck of a lot of side spill.
the reflector shape seems to have more effect.
just a thought there…at the end of the day there’s the rules of thumb, and then when you try you see it was the other thumb.
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.).
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.
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….
here