Re: Night Lights
Low-output red light will preserve night-blindness, but only because of its weak output. If you can find a green light that outputs the same level of light (lumens), it will also preserve night-blindness and run much longer on a set of batteries (it puts out more light for a given amperage).
As mentioned, momentary use of spotlight is about your best option (legal and otherwise). Keep in mind that one use of a spotlight will destroy your night-blindness for at least 5 minutes, thus the recommendation to use them only as a last resort. Night vision takes at least 30 minutes to fully develop, and any hint of light will reduce it.
Check out the light discussions over at
www.candlepowerforums.com especially the LED light forums. The enthusiasts over there are all about getting the MOST as well as the LEAST amount of light out of their flashlights. With current high-quality LED flashlights (hint: you can't get them at WallyWorld), a 2-AA flashlight (e.g. - Fenix TK20) can out-throw a typical 3-C Maglite. By the same token, you can purchase a flashlight that has just enough glow to help you navigate around the house late at night, and such a flashlight will run for several days if not weeks on a single AA battery. The low light is all about preserving your night vision.