Lighting Calculator

Real photometric calculation from the fixture's IES file — point by point, not a rule of thumb. Set your room, read the light level, get a printable report.

Fixture

Target light level

Fixture count

auto

Leave on «auto» to let the tool reach your target.

Light loss factor

0,90

Length

Width

Ceiling height

Workplane

Suspension

Workplane = the height where light is measured (desk, bench, floor for a warehouse). Suspension = how far the fixture hangs below the ceiling.

Ceiling reflectance

80 %

Wall reflectance

50 %

Floor reflectance

20 %

Typical: white ceiling 80 %, light walls 50 %, concrete floor 20 %. Darker surfaces return less light — the calculation accounts for it.

Distance

Illuminance

Power density follows: W/ft² or W/m².

Light cones in 3D

—fc

Average

—fixtures

Layout

—W/pi²

Power density

Drag to orbit · Ctrl + scroll to zoom

Light level on the workplane

— · darkest brightest · —

Your browser cannot show the 3D view (WebGL unavailable). The numbers and the report still work.

Room : — Length : — Width : — Ceiling height : — Workplane : — Fixtures at : — Reflectances : —

Minimum

—

Maximum

—

Uniformity

—

Spacing

—

Total power

—

RCR

—

Get the report

A one-page PDF with the fixture, the room, the layout and the light levels — ready to send to your client or your electrician.

Project (optional)

Your name *

Email *

Phone *

No newsletter. A LEDCO advisor may call you to refine the project. Estimate only — does not replace a sealed photometric study.