If you want to dim down a luminaire you need to reduce the energy flow to the light source. It’s as simple and complicated as that.
For an incandescent lamp it is as simple as cutting the sinus on the mains in to smaller pieces, and by doing that reducing the energy flow. For LED light sources and fluorescent tubes it is a little trickier, but it is done by either reducing the voltage/current permanent (amplitude dimming) or for an extremely short period of time (Pulse Width Modulation = PWM). When using PWM there will be flicker so it is important to know if that flicker is visible or might be a health issue.

If it’s one or the other is of no importance for your choice of control system or type of luminaire since it is always the ballast or the driver that is handling this. What is of importance for your choice is the type of signal going from our control system to each luminaire. They have to speak the same language if they shall be able to understand each other. Today there are 4 types of standardized signal / protocols used for light control communication. We have also included a much used but not standardized way of dimming.


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