"Michael A. Terrell" wrote in message
...
Eeyore wrote:
If the central heating is on, then you are, by definition, needing
extra
heat. The heat output from lighting will mean that the room
thermostat (or
radiator valves) will turn off that bit sooner.

Not really.

The heat from most lamps hangs around at ceiling level. It does sod
all to warm
a room.

Wrong.

Not wrong.

Then you've never been in a TV studio

Hey you're both partly right. As it generates heat, it will add *something*
to the room temperature. But if the fitting is at ceiling height, and since
hot air rises, it is not an efficient way to warm the part of the room that
humans inhabit. And if you don't have ceiling insulation, it will do even
less.
It's normally considered far better to place electric radiant heaters at
floor level, and relatively close to humans.

Of course the radiant heat from studio lamps is far greater than normal
domestic bulbs, but I wouldn't want to be paying for the electricity they
use either.
Even bathroom heat lamps are mirror backed to project the heat downwards,
and they are a pretty inefficient heating method regardless. Fortunately
they are only designed to be used for short periods.

MrT.