Massachusetts Institute of Technology, Cambridge, Massachusetts
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The solid-angle method of calculating illumination.
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The two-dimensional problem.
Coordinate system for illumination calculation.
The rectangular source.
Flux density from a rectangular source, in terms of the angles β and γ subtended by the source.
Flux density from a rectangular window, in terms of window dimensions.
Helios distribution for an overcast sky.
Flux density on tilted surfaces outdoors.
Flux density from a rectangular window with overcast sky.
A troffer system.
Helios distribution in a semi-circular cylinder infinite length.
Average flux density on a horizontal plane. Cubical room, ρ1=reflection factor of walls, ρ2=reflection factor of ceiling.
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