| DIMMER | Device for reducing brightness of a light (6) |
| LUMEN | Unit for measuring the brightness of a light |
| WATTS | They indicate the brightness of a light bulb |
| HUSSAR | Originally a Hungarian light horseman, later a soldier of a light cavalry regiment, usually elegantly dressed (6) |
| ARNICA | Herb used for pain caused by osteoarthritis, and for reducing bleeding or bruising after surgery (6) |
| SWELLS | Doesn't go in for reducing, like fashionable people (6) |
| ICEBAG | Contained amount of frozen water for reducing swelling (3,3) |
| LUSTRE | Brightness of some Honolulu streets (6) |
| ATOMISER | A device for reducing a liquid to a fine spray (8) |
| GLANCE | The look of a light-hearted lad who's lost a lot (6) |
| SORREL | Of a light brownish colour (6) |
| OPTARO | Program for reducing litter on highways |
| SHREDDER | A cheese/vegetable grater; a wood chipper; a device for reducing papers into unreadable strips; or, one who plays the guitar very fast (8) |
| SILENCER | Device for reducing the noise of a firearm (8) |
| UGRIAN | Member of a light-haired subdivision of the Turanian people, who include the Samoyeds, Voguls, Ostyaks and Magyars |
| LUMINANCE | From "light", the intensity of said "lux"; or, the brightness of a television (9) |
| ABSOLUTEMAGNITUDE | Measure of the brightness of a star |
| SUNLIGHT | Natural brightness of a Parisian of little weight outside (8) |
| SHREDDED | Device for reducing documents or papers into unreadable strips; any virtuoso guitarist who plays very fast; a snowboarder; or, a cheese grater (8) |
| PANTOGRAPH | Historically, a device for reducing or enlarging drawings (10) |
