DALI Dimming and Fading

DALI defines dimming for all drivers. While the dimming level is an 8-bit number from 0 to 254, these values are converted by a logarithmic curve to 4096 levels by the AL-WS-DR2. We therefore dim from 100 uA to 1400 mA in 4096 steps.

This is especially important during fade. The AL-WS-DR2 can change from one light level to another with a smooth, soft fade. For this to look good, it requires very precise dimming.

The dimming level can be set by the slider on the AL-WS-DR2, by the 3-Way switch attached to the AL-WS-DR2 remotely, or by DALI. The last level selected is stored in the switch for recall after a power outage.

If the user changes the dimming level at the switch, this is sent to the bus to be used by other switches in Tandem mode and recorded by the hub (if there is a hub).

There are two dimming levels in each AL-WS-DR2: the slider on the physical master switch, and a virtual dimmer associated with the 3-Way. Press and hold the 3-Way momentary button to change the dimming level.

If a CCT bulb is attached, then dim-to-warm is enabled by default, which can be disabled by the hub (the hub does not have to remain at the house). Fade times can also be changed. Dim-to-Warm means that the bulb goes to a warm color as the light is turned down.