Lighting simulator.

Set room dimensions and place ceiling fixtures to compare estimated light levels across the room.

Runs locally in your browserOpen electrical plan studio

Lighting study

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Mark a measured room zone

A name label does not define a room area. Draw a measured room zone on the plan, then reopen this study.

Mark room zone
Room preview
No fixtures in this room. Add a fixture to see the estimate.
Average—lux
Minimum—lux
Maximum—lux
LowHigh0 lux

Drag a fixture to move it. Use arrow keys for 0.1 ft steps, or Shift + arrow for 1 ft.

Brightness, method and limits

Brightness on the workplane is measured as illuminance in lux. More lux means more light reaches that surface; compare the average and darker areas for each layout. Output is entered in lumens (lm), the total light leaving a fixture.

Estimated horizontal illuminance from direct downward light only. Point fixtures use a symmetric generalized Lambertian distribution; beam angle means full width at half maximum. LED strips distribute their total lumens along their entered length. Lamp and wall-sconce results use the same downward approximation. Enter mounting height above the workplane. No IES photometry, reflected light, daylight, wall shadows, or furniture obstructions. Compare layouts here, then verify a real design with fixture data and a lighting professional.

This estimate does not establish lighting outlet or switch compliance. For one model-code example, see ICC 2021 E3903; check the locally adopted code and project conditions.

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Preliminary lighting study. Free-tool terms.

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