…but it says, Reflector Lens Spherical Surface+ Parabolic Reflector +Bow
They’re used for HID lamps in projectors, so that 2 sides of the light are collimated by an aspherical lens.
Slide projectors have them too (but with a halogen incandescent lamp)
Don’t bother, no chance of getting even close to that cigarette lighter thing.
That same aliexpress store has this, but it is glass so a bit fragile to put in a flashlight. And for the price I do not expect it to be optical quality.
There’s not enough enthusiasm either so that we could have a thousand pieces made in China for a reasonable price.
Plus i have no idea how to deal with manufacturers, let alone Chinese.
Maybe rename the topic to “DIY über thrower”.
Have you received that ‘solar lighter’ already?
Yes,i have seen those too.
Didn’t look too good to me
I wouldn’t mind it being made of glass though.
Awesome ‘host’ 
But they just stuck a E27 fitting in there making the whole thing pointless (hey, that’s a pun!)
Love the wooden tripod too.
Ridiculous price though.
I did some quick test on the fly with the cigarette lighter
just had the camera in one hand and the reflector in the other
its not perfectly focused but shows how it is, good hotspot and some lighter area around it, which is in my opinion not bad at all
XP-G2 R5 with dome at 0.5A
laser range meter says 11m
That looks promising Lexel !
Yeah looks very good, actually looks square, and not a circle 
the cigarette lighter is not good enough
I did compared it now to a smaller projector lens
Oh, now it looks really bad in comparison… 
I’m going to email optiforms tonight and see how much a 4-6” reflector will cost.
If it’s under $100 I’ll go for it.
Ah, that’s a pity…
Thanks for sharing.
And i bet you don’t even smoke either?
You’re gonna make us jealous.
the lens was 20cm from the LED
so overall brightness far less
and spot brightness better
both pictures use same camera settings
f2.8 1/40s ISO1600
Hah I wish, otherwise it will be a waste of $100 xd
Always good to experiment though and pass on information to others who want to try similar stuff.
Could this be the good news we’re waiting for ??
Say 4 inch diameter and deep enough to collimate 120° of the emitted light?
That would be totally awesome.
Before random ordering a reflector size/focal length, we first must establish what ‘catch angle’ is optimal for a recoil reflector, and my suspicion is that 120 degrees is too much. My fear: the outer part of the reflector will produce a larger and fuzzier image of the die and therefore hardly contribute to the throw. As well as Lexel I will experiment with the cigarette lighter reflector to see if I find the same as with the Mirascope reflector.
I’m not trying to dissuade anyone from building a recoil reflector light, but it seems some are overestimating the improvement in light collection efficiency of a recoil setup over a traditional reflector setup. A typical traditional reflector (like a C8 reflector) already collects 75% of the light emitted (lumens) from the LED, so collecting 100% of the light would only be a 33% improvement.
If you are trying to think about the total light collected by a reflector, the intensity vs angle plot (let’s call this angle theta) quoted above (from the giga thrower thread) doesn’t tell the whole story. This plot is a slice of the 3-dimensional beam profile. To get the total emitted light you have to consider this 3d shape. For example, the light is less intense at theta angles around 45 degrees, but there is actually a lot of total light in this region of theta angle because of the shape of the 3d beam; basically for the same reason a circle’s circumference gets larger as the diameter is increased. Mathematically, this means integrating around the other axis (the axis perpendicular to the LED surface). When you do this it adds a sin(theta) factor, so the total light emitted at different angles is now proportional to sin(theta)cos(theta). This is the multiplication of the intensity pattern (cos(theta)), which is greatest around 0 degrees, and sin(theta), which is greatest around 90 degrees. The result is a curve that peaks around 45 degrees.
We can get some number estimates by using wolfram alpha to integrate for us.
This integrates all of the light from 0 to 90 degrees (1.57 radians) and the answer is 0.5. This is just a proportionality factor that we’ll use to compare future calculations.
Now, a C8 reflector is ~38mm wide and ~33mm deep. It collects light greater than half angle ~30degrees (inverse tan(38/(2*33))), which is about 0.523rad.
integrate sin(x)cos(x) - Wolfram|Alphafrom.523+to+1.57
gives us ~0.375, or 75% of the total light.
“Random ordering” ?
Anyway, we should have a look at how much light is emitted to the various angles.
Do consider though that a ‘normal’ reflector thrower uses all of the wide angled light too, so apparently it’s worthwhile.
Funny the previous post used this image too:
As you can see, contrary to what previous post claims, it’s more like 75% spill with a regular set up.
In the picture you can vaguely see the yellow lines that show that a recoil set up turns everything into a beam.
I have stopped at about 145° for both reflectors because the LED does not produce much light any further.
Moreover, it’s usually greenish brown light that comes from the sides, as you all may recognise in the coronas of regular flashlights.
And maybe that’s why flashlights often have a centring gasket with a collar that shrouds the wide angled light.
Either way, a regular reflector spills some 65° of the most intense light.
According to the picture we could limit the recoil reflector to where it is 50% intensity (relative to 100% @ 0°), which happens to be around 60°, thus 120° in total.
Maybe 110° is best, reducing the diameter some more.
(edit) I was wrong, EasyB was right…