Basic Light Parameters

The Main Intensity of the light can be adjusted with this slider. By default, it is set to the middle of the slider (at 100 percent), which corresponds exactly to the light intensity defined for this lamp with the controls below. Adjust the Main Intensity slider to either strengthen or weaken this defined light intensity.
Absolute Light Intensity: Define the light source intensity in candelas or lumens.
Light Distance: (Available for lamps only if Absolute Light Intensity is unchecked.) This is an alternative way of defining the light source intensity. Light Distance represents the distance over which the source light intensity changes from 100% to 0%.
Falloff – Reduce Light Intensity over Distance: (Available for some general light sources). Check this box to reduce intensity over distance. Falloff type is always Inverse Square.
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