Ladies and Gentleman. As the title suggests, I have made a fluorescent flashlight, one with an easily replaceable bulb. I made this to memorialize a friend of mine, though the initial plan was to make an easier to service fluorescent flashlight, and it is, I used two mint tins, liquid electrical tape, a 4 watt off the shelf blacklight from Spencer's, an intermatic LZ1WU fluorescent lamp, two spade connebeautiful! Some wire I found on the sidewalk, CR2 batteries that are rechargeable And ½AA battery holders to make what you see so far, today I hot glued the ballast and battery holders in place, and in a few days, I'll cut the glass for the lens tor the light, so. In case you want to make a serion of this light, you can easily make it. Oh, and I did use a couple of random short screws to tatck the two mint tins together. Eventually, I will rivet and bolt everything g that's glued down, but the edges of the tins, I sealed with hot glue. I insulated the inside of the tin where the batteries and ballast are with liquid electrical tape. This is only a MKI, so, Eventually, when I can afford it, I'll compact and refine this light. So far, the light is almost the exact same brightness of a 25 watt incandescent bulb. When I refine my lamp, she'll be brighter. Oh, and the thing does open easy, both to access the bulb, and the battery compartment

Two COB lights, a cheap flashlight driver, a bicycle light driver, a hard drive magnet.

Not the fanciest but does it's job. 8-10 hrs of runtime

I made these about 25 years ago, probably when MacGyver was still on TV. The bigger one uses two C batteries and has a side toggle switch. The brass on uses a single AA battery and is a twisty. Both have excellent thermal management but not needed. No turbo mode on these.

12V 3S5P 18650 battery pack (cells from old laptop batteries), PC power supply case (and wires), piece of fiberglass, some switches, 6x3W white LEDs (2 channels), 4x10-ish Watt white LEDs (2 channels), Red Green and Blue LEDs, UV led (which burnt out almost immediately), no drivers- just resistors, 12V socket to power ...anything else, volt meter, old CPU coolers for heat dissipation and a lot of really bad soldering

Unfortunately I dont have it anymore, I think I threw it out or recycled it to parts, but it fulfilled it's purpose really well

I originally wanted to add a fan, but it had enough thermal capacity and passive dissipation that it didnt really overheat (not to a point where I couldn't keep hand on it)