Among the issues of LED lights dimmability amongst the of the latest challenges still yet to be fully solved. Dimming LEDs is theoretically easy, because analogue dimming, that will be the adjustment of current, has long been an option. However, this method only works safely when used with one LED bulb. Systems of LEDs require a bit more sophisticated method of dimming. The two basic regarding dimming are the PWM or Pulse-Width-Modulation and the analogue dimming, both that are switched-mode regulators. Associated with these types are similar as sense that they both control the time-averaged current through the diode.
Analogue dimming is an alarmingly simple way of dimming, it is the adjustment of cycle-by-cycle of the LED current regulated along with a potentiometer. The current is adjusted to the LED increasing and decreasing its intensity.
The disadvantage of analogue dimming constantly it only works safe as long as we dim a single lamp. Systems of Leds require a more refined technique. The difficulty of dimming an unit of LED lights is that there are a bunch many types of LEDs, requiring different methods for dimming. If there is a system of lights we have to have to dim, kinds LEDs may react diversely to the same amount of current, and as today's is reduced some LEDs can turn off later or prior to when others. Also, analogue dimming largely changes the colour among the light, similarly to when it is used with incandescent devices.
The most used technique of dimming LEDs is Pulse-Width Modulation, which essentially the cutting in the phase at a clear frequency. PWM switches the devices between fully on and fully off at a frequency that cannot be told by our eye, therefore LED bulbs always exercise on the forward current recommended. The frequency of switching determines the brightness of light, so more time the lights are 'on' the brighter the light can. This is exact sneakers technique used in incandescent light dimmers as well, apart from incandescent lights answer to current more slowly, and therefore need a different frequency.
Two types of Pulse-With Modulation signals are used often with dimming light: the leading-edge as well as the trailing edge movements. These two are different ways of cutting the phase, and end up with separate dimming methods. The most frequently used dimmers of LEDs use solely the leading-edge technology. Dimmers marked as R or RL are compatible with most dimmable LEDs, since they use the leading edge technology and do not include electronic transformers. TRIAC drivers, or devices governed together with DMX and digital addressable lighting interface (DALI) protocols and, in the future, may include wireless (RF) as a control option, which is dimmers that turn or slide along with a knob, all work with dimmable LEDs.
Alas leading edge technologies controlled using a touch or push button, are often powered by a new transformer, excluding many dimmable LEDs.
The other type of phase-cutting technique is trailing edge technique, usually used in MOSFET or is not suitable for most of of dimmable Leds. One of the latest inventions appearing on top of the market is the RAIS lamp the computer industry. RAIS lamps offer a large degree of functionality and seem to work with all regarding dimmers available by the market. However RAIS technology is still new, and its long-term effect on LEDs have not been fully assessed. If they prove end up being trustworthy their application both domestically and commercially, can come out to be much safer and easier than previous dimmable LED lights'.
In the ever-evolving technologies of LED lights, dimmable LEDs are still to be developed to further compatibility and better performance. Since work involved . no general rule for what dimmer your LED may be suitable for, always check the technical details with the rep. Application of LED lights with non-compatible dimmers might ruin the LEDs, and they are, at the moment, not the cheapest solution of lighting.