I'm also interested. Supposedly 940nm gives off no red glow, but the only 940 lights I've seen with any real illuminating range give off a red glow... supposedly due to the small amount of light produced below that wavelength. I've tried a number of them. I think it would take a somewhat high wattage 940 LED to reach out very far... which is ok, but if anyone knows of one which does that but doesn't give off the red glow when looking at it, that'd be great.