This option will set the automatic control function to NO CONTROL and will be based on the EFFICACY calculation method.
To use this lighting function you will need to have calculated a DAYLIGHT FACTOR within the zone for which the lighting function will be referencing (the 'control zone').
To use the function, under the Control Logic area on the dialog, set the Control Type to "No Control" on the drop-down list. Then choose "Efficacy Method" from the Calculation Method drop-down options. Under the Parameters area, choose whether the applied zone will act as the control zone. The applied zone will be the zone to which the internal condition is applied. Otherwise you will need to specify which zone in the model will act as the control zone. If you select another zone from the drop-down list to be the control zone, its illuminance levels will determine when and how the lights will be operated within the applied zone.
You will need to specify the target illuminance level which will be maintained within the zone, and input the efficacy value for the lighting. The efficacy value will then be used to back-calculate the lighting gain required to maintain the target lux level during the occupied period, resulting in a constant heat output at all occupied hours. The lighting gain will be a constant value throughout the occupied period, but as the efficacy will be based on the ratio of the wall to floor area of the zone it won't necessarily be the same constant value for other zones. You will also enter a PIR factor and a display lighting gain.
Example - nlcle,0,0.95,30,500,2.5
The function string begins with a '0', which indicates that the control zone is the applied zone.
The next number is '0.95', which means the lighting gain will be multiplied by a PIR factor of 0.95.
This is followed by the number '30', which represents the efficacy value in lm/W.
The '500' value is the target room illuminance.
The last value is '2.5' which is the display lighting value. During hours with sensible occupancy gain, a display lighting gain will be added. The display lighting gain will not benefit from the PIR sensor.
Let's look at a worked example, based on this function string. An illuminance level of 500lx will be maintained during the occupied period. The lighting gain will scale linearly with supplied lighting at efficacy of 30lm/W. The calculated lighting gain will be a constant value, and it will be based on the efficacy which is a function of the wall to floor area. The gains will be multiplied by a PIR factor of 0.95 to model the effect of automatic presence detection. During hours with sensible occupancy gain, a display lighting gain of 2.5W/m^2 will be added.