Downlight Planner – free downlight layout calculator

Room

Everything stays on this device and is kept in this browser as you go.

Room name Length

Width

Ceiling height

Room type Light level wanted

lux

Light it at

Downlight

Fitting (make and model) Light output

Power

Beam angle Walls and ceiling Colour Cut-out

Layout

Choose the rows and columns myself

Lights are spaced evenly, with half a spacing between the outer lights and the walls.

Layout

Mark out	From the left wall	From the top wall

A guide only. It uses the lumen method with a typical utilisation factor for downlights and a maintenance factor of 0.8 for LEDs. Real results depend on the fitting, finishes and furniture. Check the manufacturer’s data and your client’s needs, and keep the clearances from insulation and joists the fitting needs.