Electrochromic Glass: Instant Darkening

Velux has developed electrochromic glass that darkens instantly when you flip a switch. Available now with additional sizes to be offered later this year, the glass works by applying an electric current to its special layers, which then turn dark, blocking out sunlight and its associated heat. Perfect for skylights,… » 7/31/06 11:51am 7/31/06 11:51am