Signs, signs, everywhere there's signs. Blocking-up the scenery, messin' up my mind.

Or so says the Five Man Electrical Band.  "Do this.  Don't do that. Can't you read the signs?"  Well, when the lights go out, it can be difficult to see exactly where everything is.  So the next time you're in the market for EXIT signs, NOTICE signs, CAUTION signs, DANGER signs, or any other informational signs, think about purchasing photoluminescent signs.  The look 'normal' in the light, and they keep on glowing when the lights go out.  Better quality signs will keep their glow for 12-24 hours.

Resources:  Just enter "Photoluminescent Signs" into a search engine and you'll get about a bazillion hits.  You can start with the vendors I've mentioned over the past week or so, too, as they are some of the major players in the market.