I bought a little headlamp made by Energizer at Wally World for $12. Kind of a rip-off of the Petzal Tikka, for half the price. Has one red LED and two white LEDs, and runs on 3 AAA' s.
As for brightness its minimal with the single red LED. Its ok for digging through your pack or climbing your tree, but I wouldnt want to try to find my way out of Yellowstone with it. I would say the range is about 15 feet outdoors, and thats being generous.
With the two white LED' s its not half bad, maybe 25-30 feet, but you still have that bluish white color which I dislike. Still, a handy little light for the money.

I am looking at buying a SureFire E2E Outdoorsman. Has a 2 1/2 hour run time, a long pocket clip that you can clip to the bill of your hat, and they have red and blue filters for it. Kind of pricy at $75, but they are top-notch lights. I am a deputy sheriff (hence the screen name) and alot of the boys at work carry the surefire lights. They are built exceptionaly well and very bright.

Anyway, my question is, the blue light lens is advertised as helping you to see blood trails, by making the blood more apparent. Anybody had any experience with blue lights and blood?