Amongst the issues of LED lights dimmability is among 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 option. However, this process only works safely when used in combination with one LED bulb. Systems of LEDs demand a modern-day method of dimming. The 2 basic types of dimming are the PWM or Pulse-Width-Modulation and the analogue dimming, each of which are switched-mode regulators. These two types are similar within the sense that they both control enough time-averaged current through the diode.
Analogue dimming is definitely a simple method of dimming, this is the adjustment of cycle-by-cycle of 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 it only works safe as long while we dim just one light bulb. Systems of LED lights require a more refined technique. The difficulty of dimming a process of Leds is there are various kinds of LEDs, requiring different methods for dimming. If you have a process of lights we might like to dim, the different LEDs may react diversely for the same 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 from the light, similarly to when it is used in combination with incandescent lights.
The most commonly used technique of dimming LEDs is Pulse-Width Modulation, that is basically the cutting from the phase at a certain frequency. PWM switches the devices between fully on and fully off with a frequency that can not be told from 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 lighting is “on” the brighter the light is going to be. This is the same technique utilized in incandescent light dimmers as well, other than incandescent lights respond to current more slowly, and therefore require a different frequency.
Two types of Pulse-With Modulation signals are used often with dimming light: the leading-edge and also the trailing edge techniques. These two will vary means of cutting the phase, and lead to separate dimming technologies. By far the most commonly used dimmers of LEDs use solely the leading-edge technology. Dimmers marked as R or RL are compatible with most dimmable LEDs, since they work with all the leading edge technology and do not include electronic transformers. TRIAC drivers, or devices governed from the DMX and digital addressable lighting interface (DALI) protocols and, later on, may include wireless (RF) being a control option, that is dimmers that turn or slide with a knob, all work with dimmable LEDs.
Alas leading edge technologies controlled using a touch or push button, are frequently powered by an electric transformer, excluding many dimmable LEDs.
Another form of phase-cutting method is trailing edge technique, usually utilized in MOSFET or is not suitable for the majority of dimmable LEDs. One of the latest inventions appearing on the marketplace is the RAIS lamp technology. RAIS lamps provide a higher level of functionality and appear to work with all sorts of dimmers available on the market. However RAIS technology is still new, as well as its long-term influence on LEDs have not been fully tested. If they prove to be trustworthy their application both domestically and commercially, can dwxakg out to be much safer and easier than previous dimmable LED lights’.
Within the ever-evolving technologies of Leds, dimmable LEDs continue to be to get created to further compatibility and performance. While there is no general rule for which dimmer LED Constant Voltage Drivers might be ideal for, always check the technical details with all the distributor. Use of LED lights with non-compatible dimmers might ruin the LEDs, and they are generally, at the moment, not the most affordable solution of lighting.