One of the issues of LED lights dimmability is probably 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 a choice. However, this process only works safely when used with one LED bulb. Systems of LEDs require a modern-day way of dimming. The two 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 an extremely simple means of dimming, it is the adjustment of cycle-by-cycle in the LED Driver current regulated with a potentiometer. The current is adjusted to the LED increasing and decreasing its intensity.
The downside of analogue dimming is that it only works safe as long while we dim a single light bulb. Systems of LED lights need a more refined technique. The difficulty of dimming a process of Leds is that we now have many types of LEDs, requiring various ways for dimming. When there is a system of lights we would like to dim, the various LEDs may react diversely to the equivalent amount of current, and because the current is reduced some LEDs can turn off later or earlier than others. Also, analogue dimming largely changes the colour in the light, similarly to after it is used with incandescent lights.
The most commonly used manner of dimming LEDs is Pulse-Width Modulation, which is basically the cutting in the phase with a certain frequency. PWM switches the devices between fully on and fully off in a frequency that cannot be told through the eye, therefore LED Dirver Ul always run on the forward current recommended. The regularity of switching determines the brightness of light, and so the longer the lights are “on” the brighter the light is going to be. Here is the same technique utilized in incandescent light dimmers as well, except that incandescent lights respond to current slower, and for that reason demand a different frequency.
2 kinds of Pulse-With Modulation signals are utilized often with dimming light: the leading-edge as well as the trailing edge techniques. These two are different means 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 using the leading edge technology and do not include electronic transformers. TRIAC drivers, or devices governed through the DMX and digital addressable lighting interface (DALI) protocols and, in the future, may include wireless (RF) as a control option, that is dimmers that turn or slide having a knob, all work with dimmable LEDs.
Alas leading edge technologies controlled with a touch or push button, are frequently powered by an electric transformer, excluding many dimmable LEDs.
The other type of phase-cutting method is trailing edge technique, usually found in MOSFET or perhaps is not suitable for the majority of dimmable LEDs. One of many latest inventions appearing on the market is the RAIS lamp technology. RAIS lamps provide a higher level of functionality and seem to work with all sorts of dimmers available on the market. However RAIS technology is still new, and its long-term influence on LEDs have not been fully tested. Should they prove to be trustworthy their application both domestically and commercially, can dwxakg in the market to be considerably safer and much easier than previous dimmable LED lights’.
Inside the ever-evolving technologies of Leds, dimmable LEDs continue to be to become designed to further compatibility and performance. While there is no general rule for which dimmer LED Constant Voltage Drivers might be appropriate for, always check the technical details using the distributor. Implementation of LED lights with non-compatible dimmers might ruin the LEDs, and they are generally, right now, not the cheapest solution of lighting.