Same color wrong shape these are just plain flat and white. Really doesn't let a lot of light out very dim i have tried it in a dark room and not much unless your on top of something like a map or page in a book. Could it be for black out use maybe?
Originally Posted by http://www.1stconnect.com/anozira/SiteTops/light/filters.htm
Many flashlights can accept filters. (Here we are talking about regular incandescent lamp flashlights. The color of the new LED flashlights is set by the particular LED the manufacturer used. The user can not change it.) Some flashlights come with filters; they are sold as accessories for others. So, other than pretty colors, what are they for?
In the wilderness, any light stands out and will be noticed. Color has a lot to do with how easily and how far away the eye will detect the light. There is a spectrum of colors with red at one end, blue at the other, and green in the middle. Red light has the least energy and is the least noticed - there's more of it in nature. Blue light contains higher energy and, since it is uncommon in nature, it is readily noticed. In terms of how little light it takes to be detected, the eye is most sensitive to green.
Use the blue filter for signaling when you WANT to be seen. The orange and especially the red filters are a little less likely to be noticed if that is your wish. The blue filter produces light that is especially noticeable at dusk since the light from the setting sun is very red.
The red filter has another very important function. It allows you to use your flashlight without destroying your natural night vision. Once exposed to bright light, the eye takes about 20 minutes to re-adapt to the dark and become its' most sensitive. To protect your night vision, you want to use the least light possible of any color. Red light will not effect natural night vision nearly as much as the whiter light directly from the flashlight bulb. Thus, red light - and the dimmest possible for the task at hand - will best preserve natural human night vision. The filter does two things. It reduces the total amount of light and allows only red light to get to the eye.
The orange filter is a compromise, more light in exchange for a little loss of dark adaptation. Using the red and the orange together produces the same appearance to the eye but the total light is less and this is sometimes useful.
Red is also preferred for walking or signalling in fog. An incandescent lamp produces white light which is some of all colors including blue. Blue is scattered by fog more than red. Red light travels to an object and back with less scattering, while blue light is scattered and appears as a uniform, featureless glare. Red light performs better in fog than the white light from an unfiltered lamp.
Red is not, however, the best choice for driving in fog. Preserving human night vision is not the major consideration. As a practical matter, an amber filter passes more light from the lamp than a red filter. Also the eye is more sensitive to yellow than red. Amber or yellow produces the maximum light, as judged by the eye, without the glare that the blue in a bare lamp would produce. The amber or yellow filter of a conventional fog light removes the offensive blue wavelengths leaving the most visible colors in the larges quantity.
Red filters maintain your night vision and are less obvious at long distances as said before.
Used for anything at night BUT not good for reading maps! maps vary but lots have contour lines that range from reddy orange to brown making them invisible in red light.
So blue or green is used.
other than that no idea.
we used red lenses but burned pin holes in them so we could still see the red lines on the maps. worked like a charm.
Using flashlight also replaces handsignals in the dark. Green, red & white signals are used in my army. For instance green moved up & down means "move"/"faster", red from left to right in arc "stop".
I used to have freaking big Maglite 3D and red cone with me during my service in FDF. And what for... For guiding trucks! Maglite AA would we better AND LIGHTER for that job. God help that officer who bought those for that.
"in my army"? Do you have army of your own? Eheh, just kidding. Don't kill me.