AnselAdams
Supporter
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Lamp age and distance are huge variables for actual intensity. The relationship for distance alone is not linear.
Imagine the Universe!
This site is intended for students age 14 and up, and for anyone interested in learning about our universe.imagine.gsfc.nasa.gov
It is important to model lamps as photon sources, specifically. And understand the human eye is a lousy judge for parsing photon streams.
Thanks @weedtech this follows the same principals we use in photography with regards to determining & obtaining the "proper" exposure. I hope you don't mind but i have shared the link with a photographers site that i sell through. This link explains it very simply & clearly.
Thanks Again!