Lumens describe the light of the whole light source, Candelas describe light only in one direction, which makes sense only on average or if you know which direction you are talking about. ![]() Where S is the surface area of the light, which of course will depend on the geometry of the light. The rest is obvious, based on the quantities (steradians and meters squared), so the equations would be: The calculator helps you to easily convert between candela and lumens as well as lumens and candela. times the solid angle in steradians (sr): v(lm) I v(cd) × (sr). For uniform, isotropic light source, the luminous flux v in lumens (lm) is equal to the luminous intensity I v in candela (cd). The smaller the angle, the more concentrated the light is. The angle of the beam/apex is measured in degrees or steradians (a unit of solid angle). We assume you are converting between candela and lumen/steradian.You can view more details on each measurement unit: candela or lumen/steradian The SI base unit for luminous intensity is the candela. To convert lumens to candela or candela to lumens, you need to know one more thing: the angle of the beam/apex. How many candela in 1 lumen/steradian The answer is 1. ![]() There's a special function for that and it depends on spectrum of the light, but Corona uses a standard factor of 683 (see here: ) Lumens to candela calculator Candela to lumens calculation. More information from the unit converter. Lumens are the same as Watts, basically, you just have to multiply by some conversion factor, which says how much energy is actually visible and how visible it is (e.g. Yes, the other way around would be multiplication by PI.
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