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illumination curve |
octic |
A lamppost will
give the most light directly under the lamp. The illumination will decrease when you move
away from the light source. This relation is shown by a curve, which I give the name illumination
curve.
When the lamp gives light homogenous in all directions, the light stream for each unit
of area is inversely proportional with r2. For a sloping bundle of light the
light stream is proportional with the cosine of the angle α.
Now setting the light stream at the source to 1, as well as the height from the lamp to
the ground, gives the equation above.
