sorry Daren I just see that you have give the link of the entire tread I quote :D
Here is the spectral analisis of the radium 20k 150 watt direct from my radium catalog in fact this bulb is a 160 watt and not a 150 and the 400watt is a 360w
[ 07 June 2002, 17:47: Message edited by: stephane ]