>Al,
>
>convective heat transfer >> radiation heat transfer
>
>>Years ago, when Eddy Merckx was in his prime, he was put on a stationary exercise bike to see how much power he could crank out. There was no air flow, and he blew up at about 1/3 the level the investigators knew he could put out based on his hill-climbing performance during actual races.

Anyone who's exercised hard without air flow knows that in their bones <g>

Interestingly, radiative heat transfer from a blackbody varies as the fourth power of the absolute temperature - one of relatively few fourth-power relationships found in nature. Radiative heat transfer rapidly overtakes convective as the temperature climbs; convective heat loss from an incandescent filament is negligible.