Lighting Calculator

Calculate the required number of Light fittings, for a specific Room in seconds.

Candela to lumens calculator
Candela to lux calculator
Footcandles to lux calculator
Lumens to candela calculator
Lumens to lux calculator
Lumens to millicandela calculator
Lumens to watts calculator
Lux to candela calculator
Lux to footcandles calculator
Lux to lumens calculator
Lux to watts calculator
Millicandela to lumens calculator
Watts to lumens calculator
Watts to lux calculator

Measurement of light or photometry is generally concerned with the amount of useful light falling on a surface and the amount of light emerging from a lamp or other source, along with the colors that can be rendered by this light. The human eye responds differently to light from different parts of the visible spectrum, therefore photometric measurements must take the luminosity function into account when measuring the amount of useful light. The basic SI unit of measurement is the candela (cd), which describes the luminous intensity, all other photometric units are derived from the candela. Luminance for instance is a measure of the density of luminous intensity in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for luminance is candela per square metre (cd/m2). The CGS unit of luminance is the stilb, which is equal to one candela per square centimetre or 10 kcd/m2. The amount of useful light emitted from a source or the luminous flux is measured in lumen (lm).