Richard Blackwood wrote:
Once again the hot weather has reminded me of just how much I dislike it!
Last night I noticed the amount of heat given of by my ordinary bedside
lamp - IIRC something like 80% of the energy in light bulbs is heat not
light. It made me wonder whether different bulbs would produce less heat?

Ulitmately it's *all* heat, it's just that the light gets turned into
heat further from the lamp. The only energy you lose is the amount
that goes out of the window as light - not much.

--
Chris Green