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Ever find yourself walking in some dimly lit area, or with a need to distinguish yourself from a crowd? If not, then you would probably have no use for an illuminated waistcoat.
A combination of some surreptitiously placed LEDs, thin and lightweight batteries and a dimmer switch handily concealed
as a button or toggle ensure that you will never find yourself lacking for lighting again.
...among other things. [phoenix, Dec 01 2007]
Another idea for visibility in low light levels [hippo, Dec 03 2007]
EL panels would be thinner...
...though 160V drive requirements might mean you wouldn't want to be out too long in the rain. [AbsintheWithoutLeave, Dec 03 2007]
||This gets my vote, however, I would be afraid of being a moving target in the dark.
||Is it possible to use this technology to pass like ships in the night. (you know... port red, starboard green)
||... negotiuum perambulans in tenebris .....