Don’t forget that due to the narrow frequency band of any LED light you will NOT be able to distinguish between a blue and white blaze with a “white” LED light.
A friend of mine has a rather sad story about getting sidetracked pretty badly on a blue blazed trail to a water source while using a “white” LED for night hiking on the AT, whereas I have a rather amusing story about not being able to read a trail map under a red LED, due to the fact that the trail was marked in red, and therefore disappeared when my red LED was turned on. As a kicker, red or yellow text on packages of soup and whatnot also disappear under a red LED.
(BTW, most “white” LED’s are really blue, go to “http://ledmuseum.home.att.net/ledleft.htm” and page down to “How do those white LED’s really work anyway?” for an understandable explanation)
Two Speed