A candela to lumens calculator is a valuable tool for professionals and enthusiasts in the lighting industry, enabling the conversion of luminous intensity (measured in candelas) to luminous flux (measured in lumens). This conversion is essential for understanding the total light output of a source based on its intensity and the angle over which the light is distributed. To perform this calculation, the formula used is: lumens = candelas × 2π × (1 - cos(θ/2)), where θ represents the apex angle in degrees. By inputting the luminous intensity in candelas and the apex angle into the calculator, users can accurately determine the corresponding luminous flux in lumens. This process aids in the design and assessment of lighting systems, ensuring appropriate illumination levels for various applications.