I am looking to make or buy an ultra-powerful head/helmet lamp for nighttime in-line skating. It requires lots of light for safety reasons and because skate wheels are small and tend to trip on unseen things while zipping along.
Please feel free to correct, but (if you can find them) I suppose three Cree XLamp XR-E 175 lumens LEDs would cost at least $50 by themselves (what I paid for the Coleman 530 lumens LED spotlight at Academy Sports and Outdoors). The spotlight includes all of the necessary components, and I might end up dissecting the thing. Hopefully the Sealed Lead Acid battery will work in a fanny pack, otherwise maybe I will use a spare 14.4 V cordless drill battery through a 12 V regulator. I suppose a NiCad battery is more expensive but generally better than SLA. Lots of possibilities for making a very high-powered helmet lamp. My first effort was using a Brinkmann dual xenon. I probably should have used both lights instead of cutting the dual reflector in half, but then there is the runtime issue. Lots of heat too, and then replacement bulbs.
The Coleman LED spotlight is supposed to be 530 lumens with a long run time. I am guessing that it does put out some bright light but that it will be bluish. Anybody care to guess how long those LEDs will last? From reading, I get the impression that good heat sinking is important to high-power LED lifetime.
FWIW. I was also considering maybe trying to find a dimmable compact fluorescent floodlight/spotlight and hook it up to my 36 V lithium ion battery. But besides being somewhat difficult to find, I do not know whether it would start up or how much light would be emitted at 36 V. I use compact florescent lights at home and they all look great to me.