“Fenix has already been mentioned and accessories/filters are available.”

I strongly 2nd it.
I used to own a Surefire E1L. But I sold it after realizing I’m spending less money on batteries with the brighter Fenix.
Fenix is just brighter, longer battery life, uses cheaper common batteries, lower cost, less weight, and similar quality. It’s a one-hand operation to turn it on vs. a two-hand for the surefire. Or you can spend $41 for the surefire click-on switch. It comes naturally on the fenix.

I own the LD10 http://www.fenixtactical.com/fenix-ld10.html . It’s great for spotting far distances. I also use it on my bike in flash mode during the day. And I put it on my cap bill during backpacking.

And the screaming bright one (for 2AA’s) is the LD20. http://www.fenixtactical.com/fenix-ld20.html

These lights work best with Lithium AA ($1.67/ea at Sam’s Club) or 2500mA AA rechargeables. They don’t work very long with Alkalines.

For the LD10, the clip comes backwards for ball cap mounting. So I just turned my clip around . Now it can be a flashlight or headlamp.

My personal pref for red is--- don’t. I miss too much night details (including map reading) if not just using white.
Generally, I don’t like filters. They just introduce inefficiency.
The white filter will just diffuse it and give you a broad beam. For that purpose I use a zebralight http://www.zebralight.com/index.php?main...0jn8sashr43gdh2 It has an 80° flood.

Good luck in your light choice.

-Barry