Lumen-method screening

Room Lux, Lumens & LED Quantity Calculator

Estimate required lumens, lamp quantity, connected lighting load and annual energy cost from room size and entered design factors.

Enter your values

Example values demonstrate the method; they are not product recommendations.

Your result

Enter measured or nameplate values to calculate.

Method

Average illuminance uses the lumen method: source lumens × utilisation factor × maintenance factor ÷ floor area. Lamp count rounds upward.

Important limits

Screening only. Target lux, glare, uniformity, colour rendering, beam pattern, mounting height, daylight and task-plane design require a lighting professional.

Technical reference

Estimate required lumens, LED quantity and connected lighting watts from room area, target lux and utilization factors.

What to enter

Use current, project-specific values for room area, target lux, utilization factors and LED output. Check every unit before calculating and compare like-for-like inputs. The template controls the actual fields and calculations; this supporting copy does not replace its labels, formulas or result logic.

How to use the result

Treat required lumens, LED quantity and connected watts as estimates. Layout, mounting height, surfaces, glare, beam pattern and task needs require a lighting check.

Before making a decision

Verify source measurements, equipment specifications and operating conditions. Have a qualified professional review the final selection, safety and installation requirements before purchase, connection or construction.