Estimate the lumens you need from a target lux level and the floor area to light.
| Lumens | – |
Use this when you are sizing lamps for a room, a desk, or a workshop. Lumens = lux × area. 300 lux on 12 m² is 3600 lumens at the working plane if nothing is lost to walls, dirt, or a narrow beam. Real rooms need more: a typical utilization factor is 0.4–0.7, so buy extra lumens. A desk often wants 300–500 lux; a kitchen 300; a living room 100–200.
Area can be entered in square metres (m²) or square feet (ft²).
Lux: Target illuminance on the surface, in lux (lumens per square metre).
Area: Floor or desk area to light.
Lumens: Total luminous flux to aim at that plane, ignoring losses.
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