| You can define the Emission Mode
as either Luminous Emittance or
Luminous Power. If you select
Luminous Emittance, the
Emission Value corresponds to the
brightness emitted per surface area of the light source (the unit is
lux.) If you select Luminous Power, the
Emission Value corresponds to the power
emitted by the light source (the unit is lumens or lm.) Select
Luminous Power when working with
real-world specifications and using proxy surfaces as light
sources. For example, with light bulbs, designate the glass
surface around the filament as the emissive source, not the
filament itself, which is where the light comes from. Select
Luminous Emittance when altering the
size of a light source affects how much light it gives
off.
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