My L2 burner

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Kokopelli
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My L2 burner

After all those talks about green lasers and their harms, I settled on a low power <5mW laser but still I insisted on having a burner light. I had a 7.4V 15W Xenon bulb and a 28mm aspherical lens I had from DX sitting around. I have been using a fake Solarforce L2 I had from KD along with a light battery extender tube so after I had my 18650 LiFePO4 cells, I decided to make a power xenon with all these as these cells and the bulb seemed to be the perfect match, 2x(3.3-3.6V) = 6.6-7.2 and ~2Amps => 12-14W)

I removed the flat lens of L2 and put the aspherical lens in.  The blob side was looking forward at first. A protruding lens, a non fitting bezel and a useless mid range beam made it just a toy light. What is new for me, I found reversing it made better ergonomics, head standing ability and non protruding lens, floody mid range support and a sharp close focus. 

Tried this combo on a usual testbed, a black CD case.

No longer than 3-4 secs after:

 

I know it is nothing new for most of you but I have heard many good things about those nice tints of incandescant lights and this time I wanted to try some xenon/halogen. These kind of abilities just increase the joy.

 

Thanks for watching.

Edited by: Kokopelli on 05/23/2011 - 09:25
E1320
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I have a 9 volt xenon drop in kicking around, I thought I would never get to use it. So basically the lens focuses the beam to produce enough heat to set things on fire? Does the lens have to be in backwards or does it work either way?

 

I ordered one of these lenses from DX to experiment with making an XM-L thrower, I guess I better order another and maybe I will have it by Christmas.

http://www.dealextreme.com/p/glass-optics-for-flashlights-28mm-5297

Thanks so much for the great idea I love it.

I am already visualizing the duct tape over your mouth.

Kokopelli
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Exactly the same lens. I had had it to focus an XR-E led to far but found p60 reflectors annoying if focused and bezel rings won't fit fully is the lens is put protruding the head. A friend saw this and asked what would happen if the lens were backwards, tried it and saw this was a better this way. Maybe not optically but better in use. 

brted
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If you use a foy bezel, I bet the lens wouldn't stick out.

Very cool incan laser.

hansheng
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what happen if you hold it there for 1 min? Undecided

Kokopelli
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The case is penetrated easily in no longer than 15 seconds. You can even write on the case if you follow a slow pace like a character per 2 seconds. 

If you keep this on a black paper you can see it burn in red. Maybe blowing or some faster material can help it go into flames. 

hansheng
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sounds fun, gonna build one myself soon. Which bulb produce more heat? xenon or HID if same voltage given?

Budgeteer
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I believe you can do that with an XM-L and a magnifying lens pretty easily.

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

Kokopelli
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I got a Surefire G2 Nitrolon yesterday and even its 60lumen bulb gives an excessive heat. I don't think even an XM-L can compete with incandescant in heat. It is the infrared radiation making the burn. 

Budgeteer
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I tought if a random well driven XM-L can warm up my face pretty nicely focusing it to a small point can probably ignite paper... i mahy however be totally wrong. Some made ludicrous lumen led flashlight that burned paper... Youtube hoax?

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

JohnnyMac
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I have that exact lens laying around at home. I never thought to reverse it to create a "laser" of sorts. Might have to get a Xenon drop-in ($4) to get enough heat but if I can use this to light my cigars I'll be happy as a pig in sh!t!!

Smelly
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I had an old 14.4 volt xenon drop in so I popped it into a Solarforce with extension, added the lens and used 4x16340 batteries.

Lights a cigarette in a few seconds.

Only disadvantage is that it is a little bulky compared to a Clipper or Zippo.

 

Budgeteer
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LOL! the next thing would be someone using a L2P + XM-L dropin tto illuminate an acquarium along with providing heat for the required tropical water temps.

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

Ifrit
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Smelly wrote:

 

Only disadvantage is that it is a little bulky compared to a Clipper or Zippo.

 

But soooo much cooler Smile

Kokopelli
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It even works as a stove it you put on one of those spiky SF bezels and tailstand it  Smile

Smelly
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I'm looking forward to taking mine to my local bar. They know I'm a flashlight nut but I'm looking forward to lighting a cigarette in there.

 

Smoking in bars was banned this year but I live in a rural area and 50% of the bars "turn a blind eye" around here.

 

Who needs lasers!