Richard Knoppow wrote:
"Lew" wrote in message
...
Can anyone give me a run down of what's available, what to
look at &
what to avoid? Thanks.

Since others have given you some answers I will ask a
question: Why do you want to change to a cold-light head?

I would like to know as well. I'm rebuilding a Saltzman 8x10 with
condensers. I know that four 250W bulbs is going to be hot, but such has
a reliable on/off quality of light. Cold heads - dunno - they seem so
finnicky - someone enlighten me.