How to Choose the Right Dimmer: Comparison of Phase, PWM, and 0–10 V ⚡

2 Minute Read

A correctly selected dimmer is the foundation of a stable and long-lasting lighting installation. We asked a Sundrax engineer (name to be added later) to explain the difference between the main types of dimmers and how to choose the right one depending on the task. 🛠️

Phase dimming waveform illustrating chopped AC sine wave

Trailing-edge dimmer circuit board close-up


Three Dimming Methods: In Brief

Phase Dimming (Leading/Trailing Edge)

Controls the power delivered to the lamp by chopping part of the AC sine wave. Used with incandescent lamps, halogens, and some LEDs.

  • Good for traditional lamps and older systems.
  • May cause flicker with LEDs or transformer noise. ⚠️

PWM (Pulse-Width Modulation)
The dimmer works with DC and controls brightness by switching on/off at high frequency. Mainly used with LED sources and drivers that support a PWM input.

  • High stability and excellent compatibility with modern fixtures. ✔️
  • Requires specific circuitry and driver compatibility.

0–10 V (Analog Dimming)
The dimmer supplies a control voltage from 0 to 10 V to the fixture’s driver. Brightness depends on the signal level.

  • Simple implementation; an industry standard in architectural projects. 🏛️
  • Requires high-quality shielded cables; may be susceptible to interference.
PWM signal graph showing duty cycle variations


How to Choose the Right Dimmer

Type of Light Source

Incandescent, halogen → phase dimmer.

⚠️ Modern LED → PWM or 0–10 V, depending on the driver type.

Dimming Quality Requirements

✔️ For flicker-free, precise controlPWM is best. 🌟

System Scale

🏛️ For centralized installations (offices, facades) → 0–10 V is often preferable. 🏢

Equipment Compatibility

⚠️ Check the driver or fixture documentation → it must support the desired control method. 📘

Recommendation from the Sundrax Engineer

There is no one-size-fits-all dimmer. First determine the type of fixture and dimming scenarios. If the project is large, it’s best to discuss it in advance with the equipment manufacturer or an engineer to avoid issues with flicker, incompatibility, and **overheating.🔍

If you are unsure which solution to choose, our specialists will help you select the optimal combination of dimmers and drivers for your specific project. 🤝

Contact the Sundrax engineer:  Contact Us  📩

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