Room Lighting Calculator

How many lights do I need for a room?

This calculator gives you a rough guide to how many lights may be suitable for a room. The calculation is based on room size, room type and the luminous flux per light in lumens.

Please note: This calculator is not a substitute for professional lighting design. The actual lighting requirement may vary depending on beam characteristics, luminaire positioning, wall colours and furnishings.

Room calculator

Please enter sensible values for room length, room width and lumens per light.

Result

Room area
Recommended target
Required total luminous flux
Recommended number of lights

The calculation is intended as a rough guide. For more precise planning, factors such as luminaire position, beam angle, light distribution and furnishings also play a role.

Typical illuminance values by room

RoomRecommended valueNote
Living roomapprox. 150–200 LuxComfortable general lighting for living and relaxing
Dining roomapprox. 150–250 LuxA good general lighting level, often complemented by a pendant above the table
Hallwayapprox. 100–150 LuxSufficient for orientation and everyday use
Bedroomapprox. 120–180 LuxCalm general lighting with a comfortable atmosphere
Kitchenapprox. 250–350 LuxGood visibility for everyday use; work areas often benefit from additional lighting
Bathroomapprox. 250–350 LuxGeneral room lighting; mirror areas should usually be considered separately
Office / home officeapprox. 400–500 LuxSuitable for focused work

Would you like a more precise plan?

We are happy to assist you with individual lighting planning. A more detailed assessment is particularly worthwhile for open-plan living areas, kitchens, bathrooms and workspaces.