Simply put, this is how bright the sun is at the distance of earths orbit. This quantity, also known as the solar constant, is 1366.1 watts per square meter. Using data derived from ground-based solar telescopes, space shuttle missions, satellites, sounding rockets, high-altitude aircraft, and computer models, scientists and engineers in the space and solar energy communities have standardized on a value for average spectral irradiance for earth. But the quantity of the lumen is only concerned with the narrow band of visible light. All the way from radio, microwave, infrared, visible, ultraviolet, x-ray, gamma, and cosmic rays. The sun produces a broad spectrum of electromagnetic energy. How Many Lumens Does the Sun Produce?Īnother way to ask this, and the question we'll answer first is, "What is the total amount of visible light that is produced by the sun?" A lumen is a specific quantity of visible light. I'll try to clarify a number of these underlying questions by reformulating the original question a number of different ways and then provide answers to these new, and hopefully more helpful questions. We are trying to relate our experiences to all these marketing specifications. We all have lots of experience with the sun and how bright it is under a variety of different circumstances. We are bombarded with specifications for headlamps, flashlights, indoor lighting, outdoor lighting, LED lights, grow lights, incandescent, fluorescent, halogen, and the list goes on and on. The underlying question may just be out of general curiosity, but usually we are trying to build some sort of intuitive understanding of how much light a lumen represents. When people ask the question, "How many Lumens is the Sun?", more often than not, there is another question they are really trying to answer.
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