| ILLUMINATION | Enlightenment measured in candelas |
| CANDLEPOWER | Luminous intensity expressed in candelas (11) |
| SEETHELIGHT | 'Aha!' reaction, when you take in the candelas? (3,3,5) |
| LIGHTLY | With little pressure, but plenty of candelas? (7) |
| BRIGHTIDEA | Concept of many candelas? Brainwave! (6,4) |
| 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. |
| 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) |
| NIT | One candela per square meter |
| STILB | A unit of luminance equal to one candela per square centimetre |
| ANGLE | In geometry, space between two intersecting lines, measured in degrees with a protractor, for example (5) |
| REACTANCE | Non-resistive component of impedance in an AC circuit resulting from inductance or capacitance, measured in ohms (9) |
| TIME | Concept measured in horology; or, a call or bell signalling the end of permitted drinking hours in a pub (4) |
| ELLA | In medieval times, what was purchased cloth measured in? (4) |
| ANGLES | In geometry, spaces between intersecting lines, measured in degrees using protractors (6) |
| STRESS | In mechanics, applied system of forces causing deformation or strain on an object, measured in pascals (6) |
| ENTROPY | Thermodynamic quantity representing the energy in a process or system unavailable for work, measured in joules per kelvin (7) |
| ACRE | Unit in which the fields at Wylies Farm are measured in Emmerdale (4) |
| TEA | Beverage measured in spots? |
| HOTSAUCE | Condiment measured in Scoville units |
| NOAH | His boat was measured in cubits |
