| LUMEN | SI unit of luminous flux, equal to that emitted per second in a unit solid angle (steradian) by a point source with a uniform intensity of one candela (5) |
| 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. |
| QUICKTIME | Two paces per second, in a march |
| YEOMAN | Sort of money divided up by a petty officer (6) |
| SMELT | Fish that emitted unpleasant odour (5) |
| WEBER | Derived SI unit of magnetic flux, equal to 100 million maxwells (5) |
| CANDELA | SI unit of luminous intensity, roughly equivalent to the light emitted by a single candle (7) |
| ATMOSPHERE | Unit of pressure equal to that exerted by a 760 mm column of mercury at 0degreesC and standard gravity, equivalent to 1013.25 millibars (10) |
| GRAM | Metric unit of mass roughly equal to that of a cubic centimetre of pure water at 4 degreesC (4) |
| SONIC | (of speed) Having or caused by speed approximately equal to that of sound in air at sea level. |
| STERADIAN | SI unit of solid angle, used in three-dimensional geometry for objects such as spheres (9) |
| NEUTRON | An uncharged elementary particle that has a mass nearly equal to that of the proton (7) |
| LUMENS | Units of luminous flux |
| RATES | A clock's gains or losses in a unit of time; classes into which ships were assigned; or, a property tax |
| ILLUMINANCE | Clue in Milan about amount of luminous flux on a given surface (11) |
| AVOGADRO | Amadeo, Italian lawyer and physicist whose number denotes the number of particles in a unit known as a mole (8) |
| CD | SI unit of luminous intensity (2) |
| REGIMENT | Tim Green served in a unit commanded by a colonel (8) |
| DENSITY | *Amount of mass in a unit of volume |
| ARUTIUNIAN | Armenian composer with a couple of Russians in a unit, possibly (10) |
