Colored Flashlights

[James 61]

Bright neon blue is highly visable but not the brightest of the colors.

The military uses blue for map reading in tactical conditions when needing to see red lines on a map, same concept for medics or hunters with blood. BLue is night vision friendly and has a low signature.

Skam

I have to second what Skammer said about blue light. NVGs do not pick up blue light very well or at all. Red on the other hand shows up great on NVGs. NVGs aplify the lower wavelengths of light. IR lights or IR chem lights show up really well. I don't know about other areas but around here it is rare to have a miltary/Coast Guard aviation assets on a search. You could use blue but I would stick to the more conventional colors like red and white for signalling.

Just my .02