On Mon, 28 Jun 2004 19:26:11 +0100,
wrote:

In article , writes
IMM wrote:

Is the requirement to stop them getting hot?? they are designed to go
into enclosed spaces not just open lofts so I don't think heat build up
around the lamps is a problem, the requirement is to keep materials away
from the lamp so an upturned clay pot is a good solution, I did this to
mine years ago without problem.

Well the original subject is "Preventing halogen lights overheating
under Rockwool". The loft insulation is hardly going to suffer from
the heat of the lamp so what good is the plant pot doing?

It is keeping an air space around the lamp and the insulation away from the
lamp too.

It may give you "warm feelings" (ha, ha!) but I fail to see what good
it's done for anything.

The lamp will probably run hotter as it's in a very enclosed space
with no ventilation.

This is what I was trying to say in my first reply, does it matter if it
runs hotter in an enclosed space? I don't think so



Light fittings are designed to give sufficient ventilation to
allow the lamp to run at its optimum temperature.

By altering the potential airflow - and thus the cooling
efficiency - of the fitting, you will cause the lamp to run in excess
of its optimum temperature, which will lead to premature failure. Not
to mention the premature failure of the fitting itself.

I can't say that I have noted the effect in low voltage lamps -
they are largely disposed to early failure anyway - though gls and
reflector lamps exhibit the same tendency...

--
Regards,

Will.