Among the issues of LED lights dimmability is one of the latest challenges still yet to be fully solved. Dimming LEDs is theoretically easy, because analogue dimming, that is the adjustment of current, has long been an alternative. However, this technique only works safely when used with one LED bulb. Systems of LEDs demand a modern-day way of dimming. Both basic kinds of dimming are the PWM or Pulse-Width-Modulation and the analogue dimming, each of which are switched-mode regulators. Both of these types are similar in the sense that they both control time-averaged current through the diode.
Analogue dimming is a very simple means of dimming, this is the adjustment of cycle-by-cycle of the LED Driver current regulated with a potentiometer. The current is adjusted towards the LED increasing and decreasing its intensity.
The drawback to analogue dimming is it only works safe as long as we dim one particular light bulb. Systems of LED lights need a more refined technique. The difficulty of dimming a method of LED lights is there are various types of LEDs, requiring various ways for dimming. When there is a system of lights we might like to dim, the many LEDs may react diversely to the equivalent amount of current, and as the current is reduced some LEDs can shut off later or earlier than others. Also, analogue dimming largely changes the colour of the light, similarly to when it is used with incandescent lights.
By far the most commonly used technique of dimming LEDs is Pulse-Width Modulation, that is basically the cutting in the phase at a certain frequency. PWM switches the devices between fully on and fully off with a frequency that cannot be told through the human eye, therefore LEDA Driver 12v always run on the forward current recommended. The regularity of switching determines the brightness of light, and so the longer the lighting is “on” the brighter the light will likely be. This is actually the same technique utilized in incandescent light dimmers as well, with the exception that incandescent lights react to current slower, and thus need a different frequency.
2 kinds of Pulse-With Modulation signals are employed often with dimming light: the leading-edge and also the trailing edge techniques. Both of these are not the same ways of cutting the phase, and bring about separate dimming technologies. Probably the most frequently used dimmers of LEDs use solely the leading-edge technology. Dimmers marked as R or RL are suitable for most dimmable LEDs, because they work with all the leading edge technology and you should not include electronic transformers. TRIAC drivers, or devices governed through the DMX and digital addressable lighting interface (DALI) protocols and, down the road, may include wireless (RF) as a control option, that is certainly dimmers that turn or slide using a knob, all work with dimmable LEDs.
Alas leading edge technologies controlled using a touch or push button, are frequently powered by an electrical transformer, excluding many dimmable LEDs.
One other kind of phase-cutting strategy is trailing edge technique, usually utilized in MOSFET or possibly is not suitable for almost all dimmable LEDs. One of the latest inventions appearing on the marketplace is the RAIS lamp technology. RAIS lamps give you a higher level of functionality and seem to work with all sorts of dimmers available on the market. However RAIS technology is still new, as well as its long-term effect on LEDs have not been fully tested. When they end up being trustworthy their application both domestically and commercially, can dwxakg out to be considerably safer and simpler than previous dimmable LED lights’.
Inside the ever-evolving technologies of LED lights, dimmable LEDs remain to get developed to further compatibility and performance. As there is no general rule for what dimmer LED Dimmable Driver might be appropriate for, always check the technical details with the distributor. Use of Leds with non-compatible dimmers might ruin the LEDs, plus they are, currently, not the cheapest solution of lighting.