Each light source that should emit global illumination should have an energy statement (just as for caustics). Each light source can also optionally have a globillum photons statement to specify how many photons should be emitted, or specify emitted photons only by setting the first number to zero (similar to caustic photons for caustics). The default value is 100000 globillum photons. For example:
light "globillum-light" "physical_light" (
"color" 700.0 700.0 700.0
)
origin 20.0 30.0 -40.0
energy 700 700 700
globillum photons 100000
end light
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