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The difference between Triac/0-10v/Dali/DMX

Triac/front & back edge tangential dimming 

One sentence summarizes the principle: through the direct transformation of the 220V AC, cut off part of the current wave to achieve control.


The wiring method is the simplest

No dimming driver; only the module is required

The same applies to 220v AC ceiling fans or fan coils speed/power control.

Disadvantage: Advantage

The dimming module is large, the highest requirements for space and heat dissipation of the electrical box, the more light circuits occupy more space.

High wiring costs

Not suitable for the mainstream lighting design without the leading light (now most light sources are LED low voltage)


One sentence summarizes the principle: analog voltage signal control (for example, 1v corresponds to 0% brightness, 5v corresponds to 40%, 10v corresponds to 100%, most of the curve is not linear)


Dimming driver price is low

The wiring principle is simple


The highest wiring costs

The dimming module is extensive, with slightly higher space requirements for the electrical box

If the line is long, there will be a voltage drop (e.g., 10v signal drops to 9.5v at the receiving end, the dimming will be slightly distorted)

In the case of a few light circuits lower cost than Dali (for example, only one or two rooms)


The principle in a nutshell: each luminaire is a single point, which can freely combine into a circuit


The benchmark in the lighting control industry, enormous scope for upgrading, at least thirty years of use with one wiring, now DALi2 is available, with better support for dual color and RGB, and no changes to the wiring are required.

Digital signal can be grouped / control freedom, both for the group control but also for individual lamps to control

You can define the default brightness of the light on/the length of time for the light to cool down and fade out/running lights/multiple circuits to light up (for example, the foyer light fades on immediately 5 seconds later the living room light fades on, and then the foyer light slowly goes out after 5 seconds)

Dimming module is the smallest, the space requirements for the electrical box is very low (about four or five rooms occupy a total of 2 air switch position)

The wiring principle is simple and costs compromise; the more significant the volume, the more cost-effective (for example, more than three or four rooms)

The most vital anti-interference ability (because the rate is the lowest well and do not need DMX as a second within 512 channels change dozens of times)


Relative to the DMX code rate is low some

Driver price is slightly higher than other programs

Driver price is high


A sentence summarizes the principle: the controller is constantly controlling the value of 512 channels; each lamp, as long as listening to the value of a track, will know what they want to do.

DMX to give some separate examples of lamps and lanterns to say to facilitate understanding

Example 1: a single dimming accounts for 1 channel: 0-255 value 0 = brightness 0%, 255 = brightness 100%

Example 2: an RGB strip light station three channels: 255/0/0 that red brightness 100%, green and blue all off, the last is to get red, the same 255/255/255 that red, green and blue all 100%, the previous get white light all bright, this time the highest power lamps

Example 3: a brand of moving head gobo accounted for 14 channels

Channel 1: the head horizontal angle X-axis

Channel 2: vertical angle of the head Y-axis

Channel 3: dimming

Channel 4: strobe 0 ~ 10 long extinguished / 11 ~ 250 from the first 10 seconds of light and then extinguished 10 seconds ~ 10 times per second strobe (blind dog’s eye kind of effect) / 251 ~ 255 full bright not strobe

Channel 5/6/7/8: RGBW for rendering ambient colors red, green, blue and white light

Channel 9: pattern shape: 0 ~ 10 no pattern / 11 ~ 50 pentagram / 51 ~ 100 circles / 101 ~ 150 flowers / 151 ~ 200 small animals / 201 ~ 255 squares

Channel 10: pattern drift speed: 0 ~ 10 fixed / 11-255 gradually become faster

Channel 11/12/13/14: Colour of the pattern: RGBW


Digital signal, wiring method, and Dali similar

The coolest lights are definitely from DMX


Need to be carefully arranged, suitable for stage lighting, not for home (except for audio-visual room)


In the future, LED is the mainstream of lighting fixtures because more energy-efficient and environmentally friendly, effective in reducing glare, and easy to attach the effect of gradual light / gradual extinction.

So I think that the digital signal + drive is the future of dimming technology mainstream. The Dali is the most suitable for the home lighting control system; DMX is only practical for doing the audio-visual room with the excellent effect of Karaoke.


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