Here’s how to convert a cheap 12v halogen desk lamp to use with LEDs, specifically red ones for use at night during astronomical observation…also covers how to adapt it for use with a 12v power supply – Link.
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Neat although green light actually works better:
http://www.astromax.org/kniffen.htm
http://www.equipped.org/nitevision.htm
with the caveat that you need to dim the green light much more since the eye is more sensitive to green.
will this work in a dark room?