It takes the beam angle given by the user and converts it into a solid angle in units of steradians. Φ v(lm) = 400cd × ( 2π(1 - cos(60°/2)) ) = 336. The math behind the wizard is pretty straightforward. In lumens (lm) when the luminous intensity I v in candela (cd) This calculator gives accurate results for wide viewing angles, such as our LED strips with 120 deg or more. ![]() Lm = cd × ( 2π(1 - cos(°/2)) ) Candela to lumens Example#1 All results are for informative purpose only. Lumens = candela × ( 2π(1 - cos(degrees/2)) ) Times 2 times pi times 1 minus cosine of half the apex angle θ in degrees (°): The luminous flux Φ v in lumens (lm) is equal to the luminous intensity I v in candela (cd), The solid angle Ω in steradians (sr) is equal to 2 times pi times 1 minus cosine of half the cone apex angle θ in degrees (°): Times the solid angle Ω in steradians (sr): In lumens (lm) is equal to the luminous intensity I v in candela (cd), Candela to lumens calculationįor uniform, isotropic light source, the luminous flux Φ v Therefore, a direct conversion without knowledge of the beam angle is not possible. It's important to note that the conversion from candela to lumens involves considering the light source's characteristics and the angular distribution of its emitted light. The solid angle represents the portion of a sphere covered by the light source's beam angle, measured in steradians. Complete list of luminance units for conversion candela/square meter 1 candela/square centimeter 10000 candela/square meter 1 candela/square foot. Luminous Flux (lm) = Luminous Intensity (cd) * Solid Angle (in steradians) times the solid angle in steradians (sr). For instance, a standard fluorescent lighting device that emits a wide-spread beam can have a rating of 1,700 lumens and 135 candelas. The formula to convert candela to lumens is: For uniform, isotropic light source, the luminous flux v in lumens (lm) is equal to the luminous intensity I v in candela (cd). ![]() This is because the luminous flux (measured in lumens) depends on both the luminous intensity (measured in candelas) and the distribution of light within the beam angle. To convert from candela to lumens, you typically need additional information about the light source, specifically its beam angle. Lumens measure the overall brightness or intensity of the light source. ![]() Lumens (lm), on the other hand, represent the total amount of visible light emitted by a light source, regardless of the direction it is emitted in. It quantifies how bright a light appears to an observer in a particular direction. Candela (cd) and lumens (lm) are both units used to measure aspects of light, but they represent different properties.Ĭandela (cd) is a unit that measures the luminous intensity of a light source in a specific direction.
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