"Doug Dotson" dougdotson@NOSPAMcablespeedNOSPAMcom wrote in message
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"Meindert Sprang" wrote in message
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"Doug Dotson" dougdotson@NOSPAMcablespeedNOSPAMcom wrote in message
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How can running hotter be more efficient? I would think for a light
bulb,
the most energy dissipated as heat rather than light, the less
efficient
it
would be.

First, the hotter, the higher the content of visible light. The spectrum
of
emitted radiation simply moves up to shorter wavelengths when the
filament
is hotter, therefore a larger portion is in the visible range and less
in
the IR range.

Doesn;t less in the IR region equate to cooler running?

Not if you move "up" to the shorter wavelengths, which are indicated with a
higher color temperature.
The confusing thing is: higher color temerpatures are considered "cooler"
colors

Meindert