In specification of LED drivers or dimmers we usually see a keyword “Dimming curves”. That means how LED drivers set electrical parameter output in response to control signal input. Actually, the driver translates that signal to an electrical current that powers the LED. And then we can perceive the light brightness from the lamp. To accommodate the designer’s preferences and load response changes, MOONS’ LED drivers offer a variety of dimmer curve options that can be adapted to the dimmers and controllers from LUTRONLEVITON and HELVAR. Now, we discuss three kinds of dimming curves in this article.

1. Linear Dimming Curves

Linear Dimming Curves

In linear dimming curves of LED drivers, the brightness output is linear in relation to the digital signal value which is translated by the LED driver. For example, if the digital signal value is at 20%, the brightness output is at 20% in proportion. That is commonly seen in daily life, the human eyes adapt to the lighting environment across the whole range dimming.

Logarithmic Dimming Curves

2. Logarithmic Dimming Curves

In logarithmic dimming curves, the digital signal value changes slower at deeper dimming levels while faster at the brighter end. This will achieve natural changes in brightness, smooth dim to black at the low levels of light output. Normally, it is used in commercial light application.

3. Square law Dimming Curves

Square law Dimming Curves

At the low levels of light output, most traditional luminaires emit invisible light that not easily perceived. A square law curves increase the dimming effect at low control levels. A standard square law dimming curve may overcompensate for infrared loss.

At present, MOONS’ released a new generation of intelligent LED drivers – “S” series of intelligent LED drivers, accompany with Smartkey (LED driver programmer), include a variety of dimming curves are optional. Here are dimming curves that MOONS’ LED drivers build in. Customers can select curves as needed in the software. See the table below.

Dimming InterfaceDimming Curves
DALILinear, Log
DMXLinear, Log, Gamma, Square
0-10VLinear, Log

MOONS’ Dimming Curves


Dimming Curves Selection in the Smartkey software