Physics > Radiant Heat Sources
Radiant heat is energy which is emitted directly from a heat source. The table below shows the temperature (or Effective Temperature) of Selected Radiant Sources.
kelvin
temperature |
radiant energy source |
| 3 |
cosmic background radiation |
| 306 |
human skin |
| 500 |
household oven at its hottest |
| 660 |
minimum temperature for incandescence |
| 770 |
dull red heat |
| 1400 |
glowing coals, electric stove, electric toaster |
| 1900 |
candle flame |
| 2000 |
kerosene lamp |
| 2800 |
incandescent light bulb, 75 W |
| 2900 |
incandescent light bulb, 100 W |
| 3000 |
incandescent light bulb, 200 W |
| 3100 |
sunrise or sunset (effective) |
| 3200 |
professional studio lights |
| 3600 |
one hour after sunrise or one hour before sunset (effective) |
| 4000 |
two hours after sunrise or two hours before sunset (effective) |
| 5500 |
direct midday sunlight |
| 6500 |
daylight (effective) |
| 7000 |
overcast sky (effective) |
| 20-30,000 |
lightning bolt |