Smart Lighting Controls and the Application of the Dimming Curve

Definition of a Dimming Curve

A dimming curve for lighting systems refers to the relationship between the set dimming level and the actual light output produced by a dimmable light source. When you dim a light, you might expect a linear reduction in brightness as you decrease the dimmer’s setting. However, the actual relationship between the dimmer setting and the perceived light output can vary.

Are there different types of dimming curves?

Yes.

Linear Dimming Curve

The light output changes directly with the dimmer level in a linear dimming curve. For example, if the dimmer is set at 50%, the light output will be around 50% of its maximum brightness. However, the human eye doesn’t see light output linearly, so other dimming curves are often used.

Non-linear Dimming Curves

These curves are more complex and don’t follow a straight line. Some dimmable lights might have exponential, logarithmic, or customized curves. For instance, a gradual dimming at lower levels (to create a softer dimming effect) and a steeper decline in brightness at higher levels.

The human perception of brightness more closely matches the exponential dimming curve. Using logarithmic dimming curves, signals to the LED lighting driver change more slowly at  deeper dimming levels and faster at the brighter end.

Custom Dimming Curves

Some lighting systems allow customization of the dimming curve to match specific preferences or requirements for a particular application. This customization might involve software adjustments or specialized control systems. For instance, in spaces like theaters or restaurants, a smooth and gradual dimming experience is desired to create ambiance, while in other applications like offices,  precise control might be necessary. An example of this specific control is a feature of the Boca Smart Dimmer 0-10V, which enables the luminaires and controls to dim evenly with precise configuration with no flickering. Boca’s patented technology (PAT# US 11,470,697 B2) changes the paradigm of lighting control, enabling the smooth and exact dimming capabilities demanded by lighting designers.

When installing dimmable lighting systems, it’s essential to consider the characteristics of dimming curves to achieve the desired lighting effect and ensure compatibility between dimmer controls and light fixtures.

Different dimmable light sources respond to changes in dimmer settings in various ways. Knowing the dimming curve helps effectively control the light output specific to LED, halogen, or fluorescent light sources. Predicting how the light will behave at various dimmer levels is challenging without understanding this curve.

Achieving Desired Lighting Effects

Understanding these curves and what light sources are being used allows for selecting the appropriate dimming technology and setting to achieve the desired ambiance, mood, or functionality in a space.

Considering the compatibility of the light sources and dimmers is also necessary. Certain dimmers might be compatible with specific dimming curves or lighting technologies. Choosing compatible devices avoids issues like flickering, buzzing, or insufficient dimming range.

Another benefit to dimming is that it allows designers to optimize energy efficiencies by selecting dimming levels that provide adequate lighting while consuming less power.

Clearly, understanding the dimming curve is essential for selecting the right dimming technology, achieving the desired lighting effects, ensuring compatibility between dimmers and light sources, optimizing energy efficiency, and avoiding potential issues in lighting control systems.