Use pulsed mode. An external 0-10V signal applied to the analog-dimming lead will dim the output. Alternatively, a fixed resistive voltage divider tied to 24V or a potentiometer can provide a manual adjustment. Ai also offers the DCS-MP as an external dimming controller. Please see the DCS-MP data sheet for more information.
ICS 3: Brightness Settings (turning it down)
The light is too bright, how can I turn it down?