Lumen to Lux to Candela Calculator

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Pick the two quantities you know; the calculator solves for the rest.
Total light output of the source in lumens (lm) or kilolumens (klm). A standard 60 W incandescent emits about 800 lm.
Full-cone (apex) beam angle in degrees. A narrow spotlight is 10-20 deg; a wide-flood is 120 deg; an omnidirectional bulb is 360 deg.
deg
Luminous flux
800lm

Total light output (luminous flux)

Luminous intensity950.36cd
Solid angle0.8418sr
Flux (lm)800
Intensity (cd)950.36
Illuminance (lx)-

Luminous intensity: 950.4 cd

  • This source emits 800.0 lumens of total flux.
  • The beam solid angle is 0.8418 sr (steradians).
  • Strong directional beam: typical of commercial spotlights and stage lighting.

Next stepThe inverse-square law assumes a point source with no obstructions. Real-world illuminance will be lower due to beam spread, reflections, and fixture losses.

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