Light spheres are designed to measure, in lumens, visible

Last updated: 7/14/2022

Light spheres are designed to measure, in lumens, visible light or the flux of different lights, lamps, etc. A particular institute establishes standards for how these commercial spheres are calibrated. These spheres are sold in different diameters that determine the lamp length that can be tested. Find the surface area of a 58-inch light-measurement sphere, rounded to the nearest square unit.