0–10V dimming is an analog lighting-control method that uses a separate DC control signal to adjust the output of a compatible LED driver or ballast. The equipment specifications determine the dimming range and whether the system supports dim-to-off.
This guide explains how the control signal changes light output, the types of controls that use it, when 0–10V is worth considering, and the compatibility and wiring checks that matter.
How a 0–10V lighting system works
An LED driver supplies the electrical output needed by the LEDs. In a 0–10V system, the driver receives fixture power and a separate DC control signal that requests a light level. Fluorescent systems use a compatible dimming ballast in a similar role.
In the common lighting arrangement described here, higher control voltage requests more light and lower voltage requests less. The driver determines the dimming response and minimum output. Control voltage is not an exact percentage of brightness: a 1V signal does not universally mean 10% light output.
Dimming and power switching are separate functions. A driver may remain illuminated at its minimum dimming level. Some drivers support dim-to-off, meaning a supported dimming signal can turn their light output off without switching the fixture’s power supply. Other arrangements need a switching function to turn the light off. That function may be built into the control or handled by a separate relay, power pack, or load controller.
Conceptual illustration of separate power and 0–10V control paths. Switching may be integrated into the control or handled by separate equipment. Not an installation wiring diagram; follow the instructions for the specified equipment.
How the dimming signal is controlled
In a common 0–10V lighting arrangement, the driver supplies a small current to the control circuit, and the connected control regulates the signal to request a light level. This is called current-sinking control.
For product selection, follow the fixture or driver manufacturer’s guidance for compatible controls. The manufacturer’s ratings and installation instructions establish the supported lighting load and number of connected drivers.
For help with flicker, unexpected light levels, or unresponsive controls, see our 0–10V dimming troubleshooting guide.
Types of 0–10V controls and systems
Manual wall dimmers let users adjust light levels directly. Motion sensors with dimming capability can adjust lighting based on occupancy, while daylight-sensing controls can adjust it in response to available daylight.
Room-control systems coordinate controls and lighting loads within a space. Fixture-level controllers provide control at individual luminaires, while larger systems can use dimming and switching panels. A sensor or wall station may communicate with a separate controller rather than connect directly to the driver.
When to use 0–10V dimming
Consider 0–10V when the selected fixtures have compatible drivers and the project needs adjustable light levels through manual controls, occupancy sensing, daylight sensing, or a larger lighting-control system. Applications illustrated in manufacturer documentation include offices, classrooms, conference rooms, and other commercial spaces.
For an existing installation, check whether suitable control wiring is available or can be installed. Wireless controls may change how commands reach a controller, but they do not automatically eliminate the controller-to-driver connection.
Plan around the required dimming range, off behavior, and control zones: groups of lights controlled together. If the project needs individual fixture control or flexible regrouping, compare suitable fixture-level or digital control systems rather than assuming a shared 0–10V control pair provides those functions.
For help selecting a control, see our buying guide for commercial 0–10V controllers.
0–10V wiring considerations
Control-wire colors and polarity
A common 0–10V control-wire convention is violet/purple for positive (+) and pink for negative (−). Older equipment may use gray for the negative control lead. Follow the equipment’s labels and wiring diagram; color alone does not establish a conductor’s function.
Pink replaced gray as the industry convention to help distinguish dimming-control conductors from conductors using reserved colors. NEMA Bulletin 118 explains the requirement introduced in 2020 NEC Section 410.69, effective January 1, 2022. Pink itself is not a blanket NEC mandate.
Legacy gray control leads do not automatically mean equipment must be replaced. The bulletin describes permitted permanent re-identification where those leads are visible and accessible. A qualified installer should determine the identification and connections required by the equipment instructions and locally adopted code.
Example of a control with a legacy gray negative dimming lead. Use the equipment’s labels and manufacturer diagram to identify connections. This image is not an installation guide.
Class 1 and Class 2 wiring
0–10V describes the lighting-control signal, not the circuit’s wiring classification. Class 1 and Class 2 requirements affect how control wiring may be routed, including whether it can share a raceway with power conductors. Check the control-circuit ratings and instructions for both the driver and controller.
Have a qualified installer confirm the permitted wiring method using the driver and control ratings, manufacturer instructions, and locally adopted code.
0–10V specification best practices
- Confirm that the fixture or driver supports 0–10V dimming, and follow the manufacturer’s guidance for compatible controls.
- Check minimum output, dimming response, and how the system switches off.
- Verify control-current capacity separately from lighting-load and switching ratings.
- Use manufacturer diagrams to identify polarity and legacy control leads.
- Have a qualified installer verify wiring methods against equipment requirements and locally adopted code.
Explore control options at Bees Lighting in our 0–10V dimmer collection, or browse the full dimmer switch collection.
