Control tab on Lighting Templates Dialog.
If the lighting is to be controlled by the availability of natural daylight, check the 'control' option box and select the type of control.
For 'continuous' control, the overhead lights dim continuously and linearly from maximum electric power, maximum light output to minimum electric power, minimum light output as the daylight illuminance increases. The lights stay at the minimum point with further increase in the daylight illuminance.
The minimum input power fraction for 'continuous' control type is the lowest power the lighting system can dim down to, expressed as a fraction of maximum input power. For 'continuous/off' lighting control, this is the power fraction reached just before the light switch off completely.
The minimum output fraction for 'continuous' control type, is the lowest lighting output the lighting system can dim down to, expressed as a fraction of maximum light output. This is the fractional light output that the system produces at minimum input power. For 'continuous/off' lighting control, this is the power fraction reached just before the light switch off completely.
'Continuous/off' control is the same as continuous control except that the lights switch off completely when the minimum dimming point is reached.
For 'stepped' control, the electric power input and light output vary in discreet, equally spaced steps. The number of steps can be set.