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; "lux" is lumens / m^2
; (var 'symbol 'name 'units)
(var E "illuminance" 'lux)
(var Theta "luminous power" 'lumens)
(var I "pointance" 'candela)
(var Omega "solid angle" 'sterradians)
(eq Theta
(* 4 pi I))
(eq E
(/ Theta A)
(/ (* I Omega) A)
(/ (* I A) (* A (exp r 2)))
(/ I (exp r 2)))
(eq Omega
(/ A (exp r 2)))
(eq I
(partial-derivative Theta omega))
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