General tech info & rule of thumb
| C | F | Color |
|---|---|---|
| 400 | 752 | Red heat, visible in the dark |
| 474 | 885 | Red heat, visible in the twilight |
| 525 | 975 | Red heat, visible in the daylight |
| 581 | 1077 | Red heat, visible in the sunlight |
| 700 | 1292 | Dark red |
| 800 | 1472 | Dull cherry-red |
| 900 | 1652 | Cherry-red |
| 1000 | 1832 | Bright cherry-red |
| 1100 | 2012 | Orange-red |