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Posted by Dave Martindale on March 27, 2007, 4:01 pm
don@manx.misty.com (Don Klipstein) writes:
> I know this is true, but a 42 watt CFL can heat a fixture more than a 60
>watt incandescent does. I experimented with an 8 inch glass globe, a 60
>watt Sylvania "Soft White", a 42 watt Commercial Electric spiral, and a
>Raytek non-contact thermometer. The 42 watt spiral heated the globe very
>slightly more than the 60 watt A19, and not just at the top.
> More light *and* greater fixture temperature rise with less input power
>- how? The incandescent produces a lot of infrared, much of which escapes
>the fixture the same way that visible light does. With a CFL, nearly all
>energy that does not get converted to visible light becomes convected and
>conducted heat.
That's a very interesting result. However, it's worth pointing out that
the 42 W CFL was probably putting out about 3 times as much light as the
60 W incandescent. Most people replace an incandescent with a CFL of
similar light output, probably 13 or 15 W to replace a 60 W. In that
case, the fixture would be much cooler with the 15 W CFL than the 60 W
incandescent.
Dave
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