Tim Streater wrote:
In article
,
"alexander.keys1" wrote:

On Jul 12, 12:57Â*pm, Scion wrote:
The Argos catalogue has lampshades with different ratings for incandescent
and CFL lamps. e.g. Rated for 60W incandescent or 12W CFL.

What's that all about - I thought the rating was to prevent overheating and
therefore the rated wattage would be about the same regardless of the type
of lamp.

Is it me missing something obvious or is it the Argos catalogue compilers
automatically converting one to the other?

It's because of the heat emitted by the bulb, not the current drawn,
the heat production is equal to the wattage for whatever type of bulb.

I think the Argos people don't have a clue simply enough. A 12W CFL will
be a damn sight cooler than a 60W tungsten.

Further, 5 of them, drawing 60W in total, will also I assert emit less
heat than a single tungsten, because more of the energy supplied goes
into producing light, and less goes into producing heat.

Except that all of the light will end up as heat anyway, where else do
you think the energy goes? However I suppose there will be slightly
less heat in the lampshade.

--
Chris Green