Instructables
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This project draws it's insperation and technical details from dan's http://www.instructables.com/id/Ultimate-Night-Vision-Headlamp---500%2B-lumens-with-/ and his http://www.instructables.com/id/Power-LED-s---simplest-light-with-constant-current/ 
T
hanks to dan for his great instructables!

Where this instructable differs is that my four Cree xr-e LEDs are powered by a USB power supply. Any standard USB power supply will work with appropriate cables. My two main power supplies are a custom D cell holder and a Ryobi rechargeable power cell. I also have a plug in wall wart that will power the flashlight and a 12v outlet to USB adaptor that can be used to power it!

While using the D cell housing, the xr-e LEDs will put out a total of 840 lumens at 6v one amp! Standard USB delivers less power at 5v and half an amp but the LEDs  still output a very respectable amount of light, maybe around 700 lumens. Unlike most flashlights this one does not produce a beam of light. It illuminates a 180 area in front of it! It's like having a 50 watt incandescent light at your side.

Building the flashlight cost approximately $40 us. Comparable flashlights on the market are probably smaller but cost in the range of $140. It would have cost me slightly more if I didn't have the electronics sitting around my basement from disassembled TVs and stereos.

This took me a while of mucking around with parts so I don't have pictures of the build. I can only explain what I did. Maybe if I build another I'll be able to take more pictures.

Update: We just got back from a camping trip and we brought the Mega Flashlight! We had a few days where we were trying to get the camp cleaned up for bed so animals wouldn't come around. Walking around with a directional flashlight makes it hard to see everything. I stood on the picnic table and was able to illuminate the entire campsite at once! Even though I wasn't helping clean directly, everything went much faster. Now even more I want to figure out how to hang the flashlight say from a tree or some other object.

Please remember to vote for this instructable for the contest!
 
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qwerty1562 years ago
Great project! If you use lenses for the less, the flashlight will 'throw' the light forwards instead of 'flooding ' the area, ie it will focus the light coming from the leds
deyv2 years ago
Do you have a schematic/wiring diagram for this project?

Thanks
EmmettO (author)  deyv2 years ago
I followed the schematics here from dan's constant current circuit.
now if it was motion activated you could come into camp and the lights would come on. or you could protect your camp from animals by having a noise maker go off if anything moves just dont scare the p out of your own self
TSC4 years ago
It's ok!
EmmettO (author)  TSC4 years ago
Thanks!
TSC EmmettO4 years ago
You'r welcome!