I confess that I've always found a very dim white LED to be better for nighttime map reading. Trouble is, it's hard to find an LED headtorch with the required power control. I remember seeing a handtorch once, which had a 'find me' setting, which was very, very dim, but just visible in a dark tent or bag. But I can't remember what make it was, and I've not been able to find it on the 'usual suspects' websites...