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ENGINEERING TOOL

Lighting Lux Calculator

Estimate average lux, foot-candles and luminaire count from room area, lumens and utilization and maintenance factors.

Lighting Lux Calculator

FREE ONLINE TOOL
Formula and assumptions

Eavg = N × Φ × UF × MF / A; Ntarget = ceil(Etarget × A / (Φ × UF × MF)).

Average lumen-method estimate; utilization and maintenance factors are entered assumptions. Does not calculate point illuminance, glare or uniformity. Verify luminaire photometry for design.

4 luminaires × 3000 lm × 0.6 × 0.8 / 20 m² = 288 lux; for 300 lux: 5 luminaires.

NIST — illuminance units

STEP BY STEP

How to use lighting lux calculator

  1. Check the input units and assumptions.
  2. Review the result and example.

IN PRACTICE

Example

4 luminaires × 3000 lm × 0.6 × 0.8 / 20 m² = 288 lux; for 300 lux: 5 luminaires.

GOOD TO KNOW

Which formula and assumptions are used?

Eavg = N × Φ × UF × MF / A; Ntarget = ceil(Etarget × A / (Φ × UF × MF)). Average lumen-method estimate; utilization and maintenance factors are entered assumptions. Does not calculate point illuminance, glare or uniformity. Verify luminaire photometry for design.

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