Is this the same as lux or lumens?

This is a spatial planning visualizer, not a photometric calculator. For exact lux levels, use manufacturer lumen ratings and professional lighting design tools.

Can I plan multiple lights?

If the tool supports more than one source, add each fixture and check combined coverage. Otherwise, run separate passes for each planned lamp position.

Does furniture block light?

The overlay shows ideal radius on an open floor plan. Large furniture will block light in real rooms; leave margin near tall shelves and wardrobes.

Lighting Coverage Calculator

Visualize fixture spread and overlapping light zones to improve room illumination planning.

Photometric planning model

The heatmap and 3D render share the same lux calculation. It assumes ceiling downlights with inverse-square falloff, Lambert cosine correction on the floor plane, and weaker optical spill beyond the listed beam angle.

Room width (m)Room length (m)Ceiling height (m)Number of lightsLumens per lightBeam angle (degrees)Target average lux

Average illuminance14.3 lux

Peak illuminance128 lux

Uniformity min/avg0.07

Area above target0%

This is a planning-grade model for downward ceiling fixtures. Real rooms vary with wall reflectance, fixture optics, dimming, furniture, and manufacturer photometric files (IES/LDT).

About Lighting Coverage Calculator

What this tool does

The Lighting Coverage Calculator overlays light radius on a room plan so you can see how far a fixture reaches from walls and furniture. Enter room size and lamp position to judge whether corners stay dim or evenly lit.

Use it when planning desk lamps, floor lamps, or ceiling lights in bedrooms, studios, and small offices.

How to use it

1Set room width and length to match your space.
2Place or drag the light source to where you plan to install or stand a lamp.
3Adjust brightness or coverage radius if the tool provides those controls.
4Look for dark corners or double overlap where two lamps might be redundant.
5Move the light and compare a few layouts before buying fixtures.

Frequently asked questions

Is this the same as lux or lumens?: This is a spatial planning visualizer, not a photometric calculator. For exact lux levels, use manufacturer lumen ratings and professional lighting design tools.
Can I plan multiple lights?: If the tool supports more than one source, add each fixture and check combined coverage. Otherwise, run separate passes for each planned lamp position.
Does furniture block light?: The overlay shows ideal radius on an open floor plan. Large furniture will block light in real rooms; leave margin near tall shelves and wardrobes.