Here’s a quick bit of watch geekery. There are a few types of watch lume, the stuff you paint on dials to make them glow. Some companies use little vials of tritium and some just use a luminous paint that holds a “charge” for a few hours. Here is a guy who ran a test on a three watches, a Luminox, a Seiko, and a Ball. The Seiko and the Ball use tritium while the Seiko uses a standard lume. He ran the test for about three hours but you’re supposed to be able to see all three for at least 10 or so. Cool shots, though.
Lume Test: Ball EMII Diver, Seiko Monster, Luminox. [WatchUSeek]