Log in

View Full Version : height lumen measurements are taken from for bulb specs


htl
03-02-2006, 01:18 AM
my 600 watt light is rated at 95000 lumens. Does anyone know what height that rating is for? I know the lumens decrease rapidly as the light is raised, but what height is the base lumen number taken from?
Pepper
03-02-2006, 02:58 AM
The measurment for lumens is taken at 1 FT without a reflector.
htl
03-02-2006, 06:01 AM
ok, cool. So if it's at 18" or 24"(typical height for 600w?) does anyone know what the lumens are. I know there is a formula, but I can't remember it and if someone has done the calculations already that would be sweet!
Pepper
03-02-2006, 06:28 AM
How about this?