You may have seen this nice Key Chain CR2 host in the laser section...

I have a laser build kit using this great little host:
http://laserpointerforums.com/f39/fs...eet-42773.html


Here I am showing how I took a Q5 emitter with a custom heatsink, then modified an aluminum reflector and glass lens from a Pocket Mini host, and built a very bright Key Chain Flashlight which uses a CR2 supply! (primary or rechargeable)




I've got some battery current measurements to share at the bottom of the post, but first, the pictures of how the modification was done...

The pictures are in the order of the build, but first I want to show this one picture of how and why I modified a different glass lens for the build:






Now for the rest of the modification...












I am VERY happy with this Key Chain CR2 flashlight modification!

The emitter is a direct connect to the CR2 battery. No circuit. I tested a 3.0 volt CR2 rechargeable battery, charged to 3.5 volts, and I am getting a battery current draw of 460mA's.

It is very bright at this current. But I'm sure when my 3.6/4.2 volt CR2's get here, it will be even brighter!

These Q5 emitters are fine at even 1000mA's I believe... As long as they have some heatsinking.

Note: I am very surprised at just how much brighter it is at 460mA's current draw, compared to my Key Chain 10280 flashlight mod shown here:
http://laserpointerforums.com/laser_...ad.php?t=34174

I mean, the 10280 mod is drawing over 300mA's. (I regulated it with a 1 watt 3 ohm resistor because I did not want to over discharge the 200mAh battery)

But the difference is way more than I would have guessed! It is more than twice as bright at 460mA's. (guessing)





Super Bright:

With a 3.6/4.2 volt CR2, the battery current draw is 1240mA's! This is putting the Q5 emitter to it's max brightness. But I'm going to stick with the 3.0/3.6 volt CR2 battery because it is plenty bright with this supply, and with the small heatsink, I don't want to push it that hard.

This is a very bright flashlight, in a tiny Key Chain host!





P.S. This tiny mod is really a great project if you have the tools to do it, and especially if you have some parts already on hand like I did. But if you were to buy all of the parts just for the modification, it would cost about $45 or $50 bucks in just parts. That's why I couldn't really sell this modification for a reasonable price. Because of the parts, plus the amount of time it takes to do the modifications, I would want about $95 dollars to sell these mods, and I know that this is too much to spend, even though it is so unique...

So I'm just showing it as a cool project... Hope you like it!



Click here to see my list of projects and tutorials!

So genius

Glad you like it HumanSymphony!




Hidrogen, I would like to be able to offer these, that's what I had in mind when I made this one...

But in the process, I realized that the amount of work needed for the modification would not be worth selling them. Because I could not offer them at a reasonable price.

Maybe if I had some reflectors and glass lenses that I did not have to modify.

Then I would only have to make the heatsink. The assembly is not too bad though...

hay jay You Know how many lumens that Little beauty is putting out?

i am speechless!
I want to see some more p7 mods from you though! Good stuff!

how much if i will buy one on you???

please let me know via PM thanks!

I would guess over 200 lumens for sure! Very bright for how small it is!




elitesniper, I like P7's too! But no way for this tiny host. A Q5 is perfect though!




matrixcs, PM sent...

I admire your creativity :O
Once, again, well done jayrob! Keep the mods coming!

Thanks man!

Glad you like it!...

Your CR2 build is multi-use, man. Great mod, BTW!





Jayrob puts the "Awesome" on LPF.



wat

jayrob learns to make some cool stuff from the things he learns from the 'collective'. (great members at LPF!)

Thanks for the compliment Niko!

Super Bright Update:

With a 3.6/4.2 volt CR2, the battery current draw is 1240mA's! This is putting the Q5 emitter to it's max brightness. But I'm going to stick with the 3.0/3.6 volt CR2 battery because it is plenty bright with this supply, and with the small heatsink, I don't want to push it that hard.

This is a very bright flashlight, in a tiny Key Chain host!

Roughly how long would the battery last on this?

Energizer lithium CR2's have about 800mAh's capacity. The battery current draw on this build (as well as brightness), will get less as the battery drains. (direct drive)

So I can only estimate somewhere between 1 1/2 hours to 2 hours per battery...