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Dimming & Control Guide

How to choose and specify LED dimming for a lighting project: Triac phase-cut, 0/1-10V, DALI-2, DMX512 and Bluetooth SIG Mesh, plus how to match the right driver to your fixtures.

Overview

Five ways to dim, at a glance

Every dimming method trades wiring effort, control depth and cost. Use this table to shortlist, then read the section for each protocol below.

ProtocolSignalControl wiringAddressingTypical use
Triac / Phase-cutMains AC, chopped by a wall dimmerNone beyond the mains circuitNone, one dimmer per circuitRetrofits, homes, hospitality
0/1-10VAnalog DC voltageSeparate 2-core control pairNone, one signal per zoneZoned commercial spaces
DALI-2Digital 2-wire busPolarity-free bus pairUp to 64 devices per lineOffices, hotels, managed projects
DMX512Digital RS-485 dataShielded daisy chain512 channels per universeColour, facades, architectural scenes
Bluetooth SIG Mesh2.4 GHz wirelessNoneApp-provisioned groups and scenesHomes, retail, offices, no rewiring

Protocol 01

Triac / Phase-cut dimming (leading & trailing edge)

How it works. A wall dimmer cuts part of each mains AC wave: leading-edge (Triac) dimmers switch on late in the cycle, trailing-edge (MOSFET/IGBT) dimmers switch off early, and the LED driver reads the remaining wave as the dimming level.

Best for

  • Retrofits where control cables cannot be added
  • Homes and hotel rooms with one dimmer per circuit
  • Simple projects that need a familiar wall dimmer

Advantages

  • No extra control wiring, it rides on the mains
  • Low cost and widely available wall dimmers
  • Trailing-edge dimmers run quieter and suit electronic loads

Limits

  • Driver and dimmer must be compatible, or LEDs may flicker or buzz
  • Minimum and maximum load per dimmer restrict how many drivers fit
  • No scenes, feedback or per-fixture addressing

MCFION solution. Phase-cut dimming is supported for engineering projects through CG-D-PRO control modules. Send us the dimmer model and whether it is leading or trailing edge so the driver match can be checked before you order.

Protocol 02

0/1-10V dimming

How it works. A low-voltage control pair carries an analog signal from 0 or 1 V (minimum output) up to 10 V (full output), and the driver dims in proportion to that voltage, independent of the mains supply.

Best for

  • Zoned commercial spaces such as open-plan offices and retail floors
  • Projects that already run a building-management or 0-10V controller
  • Systems where each zone needs a clean, flicker-free level

Advantages

  • Simple, robust and easy to troubleshoot with a meter
  • Smooth dimming with no phase-cut compatibility issues
  • Works with many third-party controllers and sensors

Limits

  • Needs a separate control cable alongside the mains feed
  • No addressing or feedback, every zone is a separate signal
  • Long runs lose voltage; polarity must be respected

MCFION solution. 0/1-10V dimming is supported for engineering projects through CG-D-PRO control modules. Tell us the zone count and the controller you plan to use, and we will match the driver input and channel layout.

Protocol 03

DALI-2 (DT6 and other device types)

How it works. DALI-2 (IEC 62386) is a two-wire digital bus: each driver holds an address, so a controller can dim, group and recall scenes for individual fixtures. Device types define the load, for example DT6 for LED modules and DT8 for colour control such as tunable white.

Best for

  • Offices, hotels and managed buildings with many zones
  • Projects that need per-fixture control, groups and scenes
  • Specifications that call for certified, interoperable gear

Advantages

  • Up to 64 addressable devices per line, with groups and scenes
  • Two-way communication, so status and faults can be read back
  • The control pair is polarity-free and mixes with other vendors' DALI-2 gear

Limits

  • Needs a bus power supply and a controller
  • Addressing and commissioning take time
  • Higher system cost than Triac or 0/1-10V

MCFION solution. DALI-2 is supported for engineering projects through CG-D-PRO control modules. State the device type you need (for example DT6 for single-colour dimming) and the number of fixtures per line when you request a quote.

Protocol 04

DMX512

How it works. A controller streams up to 512 channels of 8-bit values per universe over a shielded RS-485 daisy chain; each decoder or driver listens to its own start address and reads one channel per colour or dimming output.

Best for

  • Architectural colour changing and facade lighting
  • Dynamic scenes, chases and synchronised effects
  • Venues that already run a DMX console or media server

Advantages

  • Fast refresh for smooth, synchronised colour transitions
  • Standard, widely supported by consoles and software
  • Scales by adding universes

Limits

  • Needs dedicated shielded cable and correct termination
  • One-way data, so the controller gets no status back
  • Channels add up fast: an RGBW fixture uses 4, so one universe holds 128

MCFION solution. DMX512 is supported for engineering projects through CG-D-PRO control modules. Give us the fixture count and colour type (RGB, RGBW or tunable white) so we can size channels per universe.

Protocol 05

Bluetooth SIG Mesh

How it works. Every mesh-enabled driver both receives and relays 2.4 GHz messages, so commands hop across the whole network without control cables, and scenes run locally with no gateway.

Best for

  • Homes, retail and offices where rewiring is not an option
  • Projects that need scenes, schedules and tunable white
  • Rollouts that grow over time, one room or floor at a time

Advantages

  • No control wiring, so install and retrofit are fast
  • Each fixture relays the signal, so the network strengthens as it grows
  • Controlled from wall panels, the L-Home app or Apple Home

Limits

  • Wireless coverage should be planned around walls and metal ceilings
  • Devices are commissioned through an app, not by wiring
  • Existing DALI or DMX installations need a control module to bridge them

MCFION solution. Certified Bluetooth 5.0 SIG Mesh is built into MCFION smart drivers, with Apple Home / Matter support and no gateway required. Drivers include the Bluetooth RGBCW Driver, CV Driver (DIM, CT, RGB, RGBW), CC Driver (DIM, CT) and a Magnetic Track Driver, with T-PWM dimming down to 0.0001%. See the full smart lighting system.

Selection

Choosing a driver or power supply

How it works. The driver converts mains power to what the LEDs need and also receives the dimming signal, so it has to match the fixture electrically and match the control protocol. Work through the steps in order.

1
Match the load type. Constant-current (CC) drivers suit downlights and spotlights whose LED module states a drive current in mA. Constant-voltage (CV) drivers suit LED strips, linear and cove runs and low-voltage track, and must match the fixture's DC voltage. Never mix the two.
2
Add up the power. Sum the wattage of every fixture on the channel and keep the load to about 80% of the driver's rated output for thermal margin. For CC drivers, check that the module's forward voltage sits inside the driver's output voltage window at the required current.
3
Pick the dimming protocol. Use the protocol your controller or building system already speaks, or Bluetooth SIG Mesh when no control wiring can be added.
4
Count colour channels. Single-colour dimming needs one channel, tunable white (CT) two, RGB three, RGBW four, and RGBCW five. The driver must offer at least that many outputs.
5
Check the controller side. Confirm dimmer minimum and maximum load, the number of drivers per dimmer, bus or universe, and inrush current on the circuit.
6
Confirm the environment. Check the input voltage range, IP rating and whether the driver is built in or remote.
ProtocolWhat to specify on the driverWhat to check on the system
Triac / Phase-cutPhase-cut dimmable driver; state leading or trailing edgeDimmer load range, drivers per dimmer, inrush
0/1-10VDriver with a 0/1-10V dimming inputOne control pair per zone, controller sink current
DALI-2DALI-2 driver or control module, with the device type (for example DT6)Bus power supply, up to 64 devices per line
DMX512DMX512 decoder or driver with one channel per colourChannel count against 512 per universe, termination
Bluetooth SIG MeshMesh driver in CC or CV form, DIM, CT, RGB, RGBW or RGBCWWireless coverage, relay density

What to send us. Fixture list and quantities, supply voltage, control protocol, dimmer or controller model, colour type and rough cable runs. We will return a driver list that matches. Prefer video? The Dimming & Control videos in our Help Center walk through wiring and setup.

Not sure which protocol fits your project?

Tell us the fixtures, the space and the controls you already have. We will recommend a dimming method and the matching drivers.

Request quote