Dear divers and flashaholics (I'm about to become one myself, this is my third lamp project, actually!),
I am currently working on a dive lamp for watching underwater bio-fluorescence.
See http://guest.engelschall.com/~sb/fluo-diving/ for a detailed collection of information about this latter topic.
My current project is technically inspired by forum user horstartur's lamp;
My lamp is based on a dive torch from the same manufacturer as his, www.tillytec.de
However, it uses ultraviolet LEDs (four NC4U133A from Nichia), whereas horstartur uses blue LEDs from OSRAM.
This has the advantage that no filters are needed for the camera and the mask.
You can see some pictures showing the progress of the project (think of it as a photo blog) here:
Any comments or suggestions are welcome!
P.S.: For my previous two UV dive lamp projects, see here:
For some of the results, see here:
(lamp #2 with two NCSU033B UV LEDs from Nichia)