Lighting a 18 × 22 ft home office
Total light needed
17,820lumens
396 ft² × 45 foot-candles
| Room area | 396ft² |
|---|---|
| Target light levelIES guidance for a home office | 45foot-candles |
| Total lumens | 17,820lm |
| Colour temperatureneutral white keeps alertness up | 4000K |
| Bulbs (800 lm each) | 23bulbs |
| Recessed cans (4 ft spacing)713 lm each | 25fixtures |
- Room
- home office
- Width
- 18 ft
- Length
- 22 ft
Where 17,820 lumens comes from
Lighting is specified in foot-candles — lumens landing on each square foot of the surface you care about. A home office is worked to 45 foot-candles. Across 396 ft² that is 17,820 lumens in total.
Split it up
One fixture putting out 17,820 lumens and 25 fixtures adding up to the same number light a room very differently. A single source throws hard shadows and glare; several spread the light and make the room feel larger. Aim for layers — ambient, task, and something low for the evening.
Colour temperature
4000K suits this room. Warmer light reads as relaxed and is what you want where people wind down; cooler light keeps edges and colours crisp, which matters where there is work to do.
Notes
- Foot-candles are lumens per square foot at the work surface. Ceilings above 9 ft, dark walls or dark flooring all eat light — add roughly 10% per extra foot of ceiling height.
- Spread the total across several fixtures rather than one bright source. One 17,820 lm fixture and 25 smaller ones add up the same but look completely different.
Nearby sizes
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