When defining a lighting fixture, you can specify the initial intensity of its light source.
The initial intensity is a measure of how much light is produced by the light source in ideal conditions. (The actual light emitted by a light source may be reduced by light loss factors.
You can define the initial intensity of a light source in a lighting fixture family file (as follows). In a project, you can change the initial intensity of an individual lighting fixture.
To define the initial intensity of a lighting fixture family
The Family Types dialog displays the new Initial Intensity value.