LED drivers have a few common dimming interfaces, and knowing which one you’re dealing with is essential before you pull any wire. 0-10V is the most common for commercial LED fixtures: a separate two-wire low voltage control signal (0-10VDC) that tells the driver what output level to run. 0V = minimum dim level, 10V = full output. The 0-10V signal is typically daisy-chained across fixtures on a zone, then wired back to a 0-10V compatible dimmer or lighting control system output.
DALI (Digital Addressable Lighting Interface) is a step up - it’s a digital protocol that allows individual fixture addressing, status feedback, and more sophisticated control. Each DALI device gets an address, and the controller can command specific fixtures or groups independently. It requires a DALI bus wire (2-wire) plus 24VDC power supply for the bus. More expensive to implement, but much more flexible.
DMX (DMX512) is the entertainment and architectural lighting protocol. Originally developed for stage lighting, it’s now common in architectural LED accent lighting and color-tunable systems. It’s a 5-pin XLR or 3-conductor shielded cable (RS-485 protocol) with a 120-ohm terminator at the end of the run.