Brightness-controlled lighting is a fairly common requirement of customers. It would seem that what could be easier than to buy a light bulb, a dimmer and connect them according to the scheme? It's not that difficult, but there are some pitfalls that can greatly spoil the mood, add to the installer's workload and require significant additional costs. This may be due to the fact that, firstly, not all lamps support dimming, and secondly, the lamp and the dimmer may simply be incompatible. 

   Let's look at both points and start with the possibility of adjusting the brightness of the lamps themselves. Any 220V incandescent bulbs that you can find in stores are guaranteed to be dimmed. In principle, there can be no problems with them. With halogen, the situation is a little more complicated. They can all be dimmed, but if you want the lamp to last its 2000-4000 hours, then you definitely need to choose bulbs with markings confirming the possibility of its dimming. An unlabeled lamp is unlikely to last more than 1,000 hours. The marking is applied to the packaging, it represents the inscription "Dimmable" or an intuitive pictogram. Currently, both of these types of lamps are used less and less, significantly inferior to LED lamps, to which we will pay special attention. 

   The packaging of LED lamps should also contain a label confirming the possibility of brightness adjustment. If there is no marking, then the lamp may behave incorrectly when connected to the dimmer. The most common options are regular flickering or glowing at the same brightness, regardless of the position of the dimmer. But even by purchasing a lamp with the appropriate label, success will not be guaranteed. But the thing is that dimming can also be implemented in different ways — by cutting off the front (Leading Edge Dimming) or the rear (Trailing Edge Dimming) front. Unfortunately, it is extremely rare to indicate which of these methods controls the brightness of the lamp on the packaging. Information can more often be found in the manufacturer's catalogs.

   In order to understand why there is still no single regulatory standard, it is necessary to delve a little into history. LED lamps have been in our lives for a long time, but light regulators appeared much earlier. They controlled the brightness of halogen and incandescent lamps. The ideal control for them is to cut off the leading edge, besides, the dimmers of this type are more compact and cheaper than their counterparts.

   For LED lamps, rear-edge clipping control is much better. But due to the fact that by the time LED lamps appeared, the market had already been captured by front-cut-off dimmers, light bulb manufacturers had to adapt to them. Lamp manufacturers did not want to lose sales of lamps due to the fact that they are not compatible with tens of millions of dimmers already installed in people. Gradually, the number of LED lamps increased, along with them, dimming regulators began to appear along the rear edge, and lamp manufacturers began to produce their products that supported both types of dimming or were generally dimmable only by cutting off the rear edge.

   This process is underway right now. It is for this reason that there are large numbers of both types of dimmers and lamps on the market that support one of two or both types of dimming.

   In any case, for the normal operation of the dimmer and the lamp, it is necessary that their dimming methods match. You can check compatibility by reading the instructions, catalogs, consulting with the seller, or checking compatibility directly in the store. 

   One of the frequent questions received by the technical support of the Smart Electronics company is to determine the compatibility of lamps and a dimmer already installed in the apartment. We recommend using the algorithm described below. If, after switching on, the light is adjusted correctly in the range from 20% to 100% and the lamps do not emit sounds, then the dimmer is compatible with the lamp. If the light bulbs are beeping or buzzing, they are most likely not compatible with the dimmer control method used.

   Until 2024, SE Dim2o modules adjusted brightness only by cutting off the leading edge. Be sure to consider this when selecting LED lamps or LED strip drivers.

   The SE Dim2o modules currently available support both ways of brightness control. If, after installing the lamp, it turns out that it is not compatible, it is enough to enter the module settings and change the dimming method.