Photometry Tools

Lighting & Photometry Calculators

Compute transitions between candelas, lumens, lux, footcandles, and electrical lightbulb power in watts.

Candela to Lumens

Convert light intensity in candela to luminous flux in lumens using the apex beam angle.

Find surface illuminance in lux from source intensity in candelas and physical distance.

Convert English standard footcandle illuminance values to metric lux instantly.

Calculate candela luminous intensity from overall light output in lumens and beam angle.

Find light density in lux based on total output in lumens and surface coverage area.

Convert lumens output to millicandelas for precise diode, laser, or LED beam angles.

Estimate electrical power consumption in watts from output lumens for various light sources.

Calculate light source intensity in candelas based on illuminance in lux and distance.

Convert metric lux illuminance back to standard English footcandle parameters.

Find total lumens output required to achieve a target illuminance level in lux over a given area.

Calculate power in watts needed to illuminate an area in lux based on lightbulb efficiency.

Convert fine-scale millicandela intensity to overall luminous flux in lumens using beam angle.

Calculate luminous flux output in lumens based on electrical watts power and bulb efficacy.

Calculate surface illuminance in lux produced by electrical power in watts and bulb efficacy.