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Old 03-30-2011, 10:29 PM #1
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Default OEM lasers in 26.5mm modules?

I* have been wondering about the number of flashlights that use the 26.5mm drop-in with either LED or incan.

Why is nobody making heatsinks and/or finished modules for them?
(Moh, I am looking at you. )

The only problem I can see is that tolerances of hosts may wary a bit and necessitate a loose fit of the upper (diode) end.


*And JaiNobeZ, while discussing a new host.


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Old 03-31-2011, 05:44 PM #2
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Default Re: OEM lasers in 26.5mm modules?

Here here!!

And me & Toke should get one each free because we thought of it...
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Old 03-31-2011, 06:12 PM #3
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Default Re: OEM lasers in 26.5mm modules?

I've got a secret for you.... they are

Hotlight heatsinks fit the 501b fantastically.
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Old 03-31-2011, 06:18 PM #4
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Default Re: OEM lasers in 26.5mm modules?

What!!!

I just checked, the heatsink from the blue hotlight is too long for the WF-501b.
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Old 03-31-2011, 06:51 PM #5
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Default Re: OEM lasers in 26.5mm modules?

this is off topic, but you know toke, with a FAN COOLED setup, that 12x could take more abuse than 400mA, she want's to be treated like a lady of the night, not a queen
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Old 03-31-2011, 07:01 PM #6
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Default Re: OEM lasers in 26.5mm modules?

Quote:
Originally Posted by jakeGT View Post
this is off topic, but you know toke, with a FAN COOLED setup, that 12x could take more abuse than 400mA, she want's to be treated like a lady of the night, not a queen
:dl:
Yes, you got a point there.
I am going to wait a few days more for my 2.5W LPM to arrive before I start making "unusual demands" any diodes or crystals.

(I think it was the famous Casanova who said something about treating a maid like a lady and a lady like a lady of the night.)

Right now I am busy making meatballs for the freezer and a family lunch tomorrow.
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Old 03-31-2011, 07:23 PM #7
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Default Re: OEM lasers in 26.5mm modules?

Another secret - the heatsinks between multiple hotlights are not always the same.

Not sure why, but that's the case. About 1 in 4 of my hotlights heatsinks fit the 501B. At least that was my experience.
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Old 03-31-2011, 07:31 PM #8
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Default Re: OEM lasers in 26.5mm modules?

Quote:
Originally Posted by rhd View Post
Another secret - the heatsinks between multiple hotlights are not always the same.
I usually buy 10pcs of a particular host and even though they are
the same batch, the finishing cuts to the heatsinks are done on a
one on one basis.

If you make all 10 heatsinks, some will be small, and some large..
Unless the host is made well, the tolerance can and usually is,
all over the place..


Nature of the China beast.
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Old 03-31-2011, 07:33 PM #9
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Default Re: OEM lasers in 26.5mm modules?

Maybe I am a bit critical at the moment, it just turned out that the heatsink I made for my aurora SS 16340 is a 0.2mm too small and rattle in the host.

The hotlight heatsink would need to be cut in half to fit my 501b, that is a solution, but not quite what I were looking for.

You just see next month when I am back on-board with a lathe.
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Old 04-04-2011, 09:01 PM #10
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Default Re: OEM lasers in 26.5mm modules?

The problem lies with the non-standard sizing of the P60 pocket. Best idea is to either make a drop-in that fits all and has tons of mass so that if heat doesn't transfer to the host it doesn't really matter, or to make 'em on a per-model basis, in which case you would want to pick more reputable models whose dimensions don't change.

I've thought about it for a while, ended up getting mine custom made. First thing I did when I joined LPF was bug FlaminPyro about it
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Old 04-07-2011, 07:06 AM #11
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Default Re: OEM lasers in 26.5mm modules?

Yeah, the 'OEM 26.5mm' format is called a P60 drop-in. There's a metric shittonne (I'm not lying about the 'metric' part), and they're all different.

I have a handful of L2s and a C1, all from Ultrafire. All take a P60 drop-in, and in each of them, the drop-in sits differently. There's a fair bit of play, which is alright for a light, but with a laser module, where optimal heatsinking is needed, such tolerances are undesired.

Consequently you're going to have to custom-fit every heatsink. There's no other easy way, unfortunately.
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Old 04-12-2011, 09:44 AM #12
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Default Re: OEM lasers in 26.5mm modules?

Bumping an old thread and all that... yeah.

It's just occured to me. In this Super Red Beast 006 635nm 40mw build copper tape was used to increase the width of the module to fit the heatsink. Provided the module in the heatsink was a good, tight fit so the heat is being dissipated from module to heatsink effectively, and on the understanding that diode lasers don't produce a LOT of heat, they just are very sensitive to the heat they produce, wouldn't copper tape be sufficient to pad out the heatsink so it would fit into a host with a larger slot?

In which case, couldn't these modules be produced 25-26mm and then be expanded the last few millimetres by 2-3 layers of copper tape?

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Old 04-12-2011, 09:52 AM #13
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Default Re: OEM lasers in 26.5mm modules?

I doubt that cobber tape would give a good enough fit.
At least compared to a heatsink that is machined to fit.

And yes, the answers here have shown me why the idea a p60 laser dropin is not used.
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Old 04-12-2011, 09:57 AM #14
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Default Re: OEM lasers in 26.5mm modules?

Yes you could do that but rember the copper tape has a layer of glue so you heat transfer is not going to be good


Quote:
Originally Posted by JaiNobeZ View Post
In which case, couldn't these modules be produced 25-26mm and then be expanded the last few millimetres by 2-3 layers of copper tape?

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Old 04-12-2011, 08:36 PM #15
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Default Re: OEM lasers in 26.5mm modules?

In the other thread:
Quote:
Originally Posted by Grix View Post
I still don't think copper tape is good heatsinking, because of the air between the layers.
Quote:
Originally Posted by midias View Post
I would agree if the adheasive on the back side was not a thermal and electrical conductor as well as serving to remove air when properly applied.
Idk who to believe. Maybe midias knows something we don't, or maybe he's misinformed, or maybe i'm misunderstanding and it was appropriate for that situation and now isn't.

Cue midias!
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Old 04-12-2011, 08:42 PM #16
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Default Re: OEM lasers in 26.5mm modules?

It works - both in terms of conducting heat and electricity. My F22 Viper used this approach because I didn't have a perfect custom heatsink.

I probably wouldn't INTENTIONALLY build a laser this way if you have a reasonable alternative. But it works. I also wouldn't pursue this approach for a 2W build, but for a 1W laser that is small and has short duty cycles anyway, you can get away with it.
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SAFETY & IMPORTANT READING (threads authored and contributed to by various members of LPF):
- Federal Aviation Administration - Laser Safety Initiative (link)
- Info release from Laserglow - Default Canadian restrictions on portable lasers (link)
- The Necessity of Safety Goggles (link)

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