| If the illuminant was acetylene gas, the lens rotation could be driven by gas pressure. |
| For the illuminant used in enlarging, we may employ either daylight or artificial light. |
| Petroleum has been used to some extent both as a fuel and as an illuminant. |
| The electric-filament lamp, which came into general use in the 1920s, is now the standard illuminant. |
| Lexx casts an illumination spell so that they can all better see and they continue on with the glowing illuminant orb leading them. |
| When replacing the illuminant, allow the Halogen floodlight to cool to the ambient temperature. |
