AC LED modules, commonly referred to as ‘Direct-AC’ is a module or light engine that accepts high-voltage Class-1 alternating current (AC), rather than low-voltage Class-2 direct current (DC). On an AC module the power conversion is done on-board so that the LEDs see a safe current that is typically below their LM-80 test current.
While most commercially available AC LED systems are either 120V or 220V input, LUXTECH has developed a unique system that can run on any voltage from 90-305VAC.
Most AC LED systems have to have some inherent flicker, but it is often not perceptible. Flicker is best measured by the Lighting Research Center’s Flicker Index, which in general determines how long the LEDs are on during each cycle. Most manufacturers agree that for applications other than task lighting, a flicker index of 0.3 or less is acceptable. Many magnetically-ballasted CFL and standard LED lamps have inherent flicker, typically ranging from .10-.39 flicker index. Dimming can often exacerbate flicker in all LED systems, not just AC systems.
With the elimination of the driver, you are now bringing Class 1 power straight to the module, rather than Class 2 power. Therefore, the protective chamber that houses the module requires a tooled entry as well as a plastic or glass lens with a UL-5VA flame rating. Oftentimes luminaires that were previously designed for HID systems are already compliant.
Yes, AC LED systems are currently on the market that are triac, 0-10V, and wirelessly dimmable. Just like with DC systems, dimming performance varies by product and dimmer type, but in general is seen as acceptable in most applications.
No, an AC LED driver circuit is typically between 80-90% efficient, right in line with most external LED drivers
By eliminating electrolytic capacitors, AC LED systems have eradicated the number one cause of failure in LED luminaires. In most systems the LED current is limited to not exceed the LM-80 current and the components are often rated for 100,000 hrs+.