There are several ways to dim LED strips with constant voltage. Each method has pros and cons depending on budget and installation limitations.
Dimming with a Controller
You can dim LED strips by using a dimmable or non-dimmable driver. This is the easiest method as it does not require additional wiring. Dimming occurs on the DCV (driver) side, with a controller placed line between the driver and the LED strip. Usually, there is a controller and a remote. Some controllers accept other inputs such as “Push” or 0-10V.
Pros:
- Easy to install
- No need for extra wiring
Cons:
- Requires the purchase of a controller
- Dimmable or non-dimmable lights are usually more expensive
Using a Dimmable LED Driver
There are many different dimmable constant voltage drivers. They can be classified into two categories: dimming the AC side or using a signal control injected into the driver’s control wires.
Triac (Phase Cut) Dimmable Driver
A triac dimmer is used to dim the AC side. This can be a traditional rotary dimmer or a push-button dimmer mounted on a wall plate. These drivers are designed to work with a leading edge or a trailing edge dimmer on a wall plate. The dimmer is directly connected to the ACV input of the driver.
Pros:
- Works with existing wall dimmers
Cons:
- Can be costly
- Finding a quality brand can be challenging
- Some dimmers do not dim to 100% off
- Noise and disruption can be caused by other electrical equipment
- It can be difficult to find an appropriate dimmer that works well with the driver
Signal Input Dimmable Driver
The dimming signal is carried by an additional pair of wires on these drivers. Typical dimming protocols include 0-10V, DALI, DMX, or a variable resistance. This allows for a flexible and customizable design.
Pros:
- Cost-effective
- Offers flexible and customizable design
Cons:
- Not ideal for existing installations as it requires an additional pair of signal wires to be installed
- Requires a driver-load ratio of 90-95%
- The exact weight of the load may not be known until after installation
Importance of PWM Output
When using a driver that dims the signal, make sure its output is PWM. PWM dimming doesn’t require load matching, which means you always get consistent full-range dimming, regardless of driver size or load. You can achieve the same dimming level using drivers of different sizes when operated by the exact same dimmer. PWM offers 0-100% dimming with no flicker.
Pros:
- Consistent full-range dimming
- No flicker
Cons:
- Requires compatible PWM driver
By considering these options, you can choose the best method to dim LED strips based on your specific needs and installation constraints.
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