Yet another aspheric thrower

Decided to make a more portable/compact optofire using the short focal length A037 lens I had.

Osram CULNM1.TG 1mm^2 LED
3S 6A mountain electronics buck driver
32mm wavien collar
120mm A037 Optolife aspheric lens
Copper heatsink and 80mm noctua fan
External battery (soon to be replaced by 3x18650 internal batteries)

Measured at 50m
Lx1330b - 1500 lux
Tasi TA8132 - 1552 lux
Tasi 632A - 1504 lux

1500 lux @ 50m = 3.75Mcd

A bit lower than I had hoped for however the smaller heatsink, small wavien collar, and lens imperfections all contributed to lower performance than the original Optofire.
It also seems like a small portion of the lens around the outside (only a millimeter or two) is not receiving light due to the aperture angle of the collar.
A slightly longer focal length lens or larger collar angle would make use of the full diameter of the lens. This wasn’t a problem with the long focal lenth A380 lens.
The A380 lens also was better at focusing, with less aberrations.

Despite this, the advantage of the thic A037 lens is that all the light coming out of the collar is being collected, about 500 lumens all going into the beam.
The result is a very bright and visible beam :slight_smile:

Light engine assembly:



Video in a large room filled with haze:

Once I have the 18650 battery carriers mounted inside I might consider selling this light :slight_smile:

A few hundred dollars, maybe close to 400 if you include all the shipping and taxes and stuff.

The most valuable part is the collar which isn’t available to buy anymore, so even though the price for it was only like $75 it’s worth a lot more due to rarity.

Sweet build, and excellent performance!

Thanks :slight_smile:

Another awesome Enderman build :+1:

I’m curious to know why you think the smaller heatsink contributes to lower output? I mean it’s fan cooled….

The LED is being run at its peak, but the higher the temperature it is at the lower the output.
Usually I try to use larger CPU heatsinks, at least ones with heatpipes to move the heat away from the MCPCB faster.

In this build I had to use a low profile server heatsink and low profile fan to keep it compact.
It’s still better than just a passively cooled flashlight body, but not as good as the BXTS13A I used in my previous builds, and far from as good as something like a NH D15 which would be the best possible scenario.

Did you measure the temperature?

Nope, but it hasn’t burnt up so far so all good :smiley:

Someone get this man a LEP :smiling_imp:

Why? He’s already making lasers from regular LEDs! :open_mouth:

Good job on the build, Enderman!

Maybe I’m still too newbie to understand or I just prefer flooders, but…
what is the point of making such flashlights?
Except for fun.
Too large for short distances. And too focused light.
For a long distance illuminates a small point and you need to use a binoculars to see anything.

There are actually a small minority of BLF’ers that can use a good thrower like this. For the rest, it’s just a toy. I don’t have any use for a thrower, but I’m definitely impressed by the reach of these things. I’m not a flooder either, though. I prefer a medium size hot spot and a decent amount of corona, with very little spill. Some of my favorite lights are TIR.

I’m working on one!

Thanks! <3

Yeah mostly for fun, it’s like a fat laser with a very visible beam that isn’t dangerous to the eye and can’t cause fires.
At 1 or 2km the spot is large enough to light up a house, so even though you can’t see very many details from that far away you can still clearly tell that there is a house, without using binoculars.
Your vision is better than you think, look outside, you can still see stuff at 5, 10, 15km away.

And I might consider buying it :slight_smile:

Well, not yet

And many light-years away. too!

:open_mouth: :smiley:

hahaha true!


A flashlight with a Noctua fan...

It would be interesting to see how much relative output the LEDs looses over time due to heating up.

You monster. I’ll have to keep my eye out for a build thread :wink:

Ah true, I could take several lux measurements over time.
When I did the intensity measurement I waited a few minutes before taking the final reading.


It’s impressive to see what you can do with only 3 screws. :smiley:

Isn’t it this one ? : Received the second component of my future project