![]() Taking the previous equation 1lm = 1cd * sr, and the light intensity of 1cd, along with the surface area of the sphere at 12,57m², we can calculate: The first step is to calculate the surface area of the sphere. The same equation will also give you the luminous flux from the sphere. 1 lumen = 1 candela a light source with 1 candela intensity produces 1 lumen of luminous flux in a sphere with 1 square meter surface area.sr = steradian (square radian, one square radian of a general sphere can be calculated using an equation A = r², with r representing the radius of a sphere.When you want to know a flashlight’s level of brightness, check the candela rating. Putting it into practical terms, When you want an all-directional light, look at the lumens. When you cut a 1 square meter hole in the center of the sphere, you have one lumen of light. The candle produces one candela evenly in all directions. One way to explain lumens and candelas is to imagine placing a transparent sphere one meter over a lit candle. A candela is a unit of luminous intensity.Luminous intensity measures the amount of light emitted in a single direction. ![]()
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