Lighting Units Table
Australian English table for lux, lumens, watts, efficacy, beam angle, colour temperature, CRI and related lighting units.
lux = lumens / m2
Lux describes light arriving on a task plane or measured surface.
lumens = lux x m2
Lumens describe the output allowance before fixture count and layout checks.
lm/W
Efficacy compares light output against input power for the same luminaire role.
Table PDFLighting Units Table
Download the table with the page URL and retrieval date for offline lighting checks.
| Term | Unit | Technical role |
|---|---|---|
| Illuminance | lx | Light arriving on the named floor, desk, bench or shelf-face plane; 1 lx equals 1 lm/m2. |
| Luminous flux | lm | Visible output to carry into lux-to-lumens, fitting-count and schedule comparisons. |
| Watt | W | Electrical input for a lamp, driver or luminaire group; record it separately from brightness. |
| Efficacy | lm/W | Output per watt for the same luminaire role, output basis and control condition. |
| Colour temperature | K | White-light appearance for a visible zone; keep it beside lux, CRI/Ra and glare notes. |
| Colour rendering index | CRI or Ra | Colour-rendering cue for faces, food, finishes, labels and display surfaces. |
| Beam angle | degrees | Optical spread used to estimate footprint before spacing, aiming or wall-wash checks. |
| Candela | cd | Directional intensity for optic and glare records, not a substitute for room lumen totals. |
| Utilisation factor | UF | Delivery assumption for how much luminaire output reaches the assessed plane. |
| Maintenance factor | MF | Maintained-light allowance for dirt, ageing, lumen depreciation and access conditions. |
| Connected load | W or kW | Input load for one lighting group, used in energy, density and coordination records. |
| Energy use | kWh | Load over time for annual lighting running-cost and saving estimates. |