Originally Posted by sanjoh
That's a tough one. What have you been using for your research? Perhaps it could be adapted to the helmet light?
Existing headlamp units which can be electrically switched between normal white, green, and red. No detailed research, just experience using a LED headlamp with this feature --- night hiking, cross country etc. These colors are used to preserve night vision - red being traditional. I assume that was the reason for the earlier request for a red lens. Some folks, myself included, find green to be much more effective. The headlamp and the strap assembly move this lamp into another market. This is one kick-ass headlamp for the money.