| EXPOSUREMETER | Photographic device indicating the amount of light present (8,5) |
| ETHEREAL | Light present during twilight, uplifting (8) |
| LM | A unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions. |
| PINHOLECAMERA | Simple photographic device (7,6) |
| DIGITALCAMERA | Non-film photographic device (7,6) |
| KRYPTONISOTOPE | The length of a meter is based precisely on the amount of light emitted from this |
| METRONOME | Mechanical device indicating the tempo of a piece of music |
| EXPOSURE | In photography, which word indicates the amount of light allowed to reach the film (or sensor)? (8) |
| IRIS | It controls the amount of light admitted |
| FSTOP | It controls the amount of light admitted |
| OILGAUGE | A device indicating the levels of lubricant in a vehicle or machine (3,5) |
| LUMEN | Unit of luminous flux, or amount of light, used often in artificial lighting applications that is defined as the amount streaming outward through one steradian from a uniform point source having an in |
| DELUXE | Opulent duke showing amount of light flooding wings of estate (2,4) |
| APERTURE | Device controlling amount of light admitted (8) |
| PHOTON | A tiny amount of light still at start of November (6) |
| ASTRAY | Off course when facing first sign of this amount of light (6) |
| ALUMNI | Schoolkids once in class restricting amount of light to save energy (6) |
| LEANTO | Shed small amount of light on tea that's stewed (4-2) |
| INFLUX | Stream data endlessly, given amount of light (6) |
| RAY | Amount of light ready on odd occasions |
