How to Choose Dimming Curves, Linear or Logarithmic?

Often, the LED lighting system consists of a (wall) dimmer or controller, a driver and a luminaire. To dim the light, you move the slider or turn the wheel and the dimmer sends a signal to the driver. The driver translates that signal to an electrical current that powers the LED.

In linear dimming curves of LED drivers, the brightness output is linear in relation to the digital signal value which is translated by the driver. For instance, if the digital signal value is at 25%, the brightness output is at 25%- see A.

However, in logarithmic dimming curves, the digital signal value changes slower at deeper dimming levels and faster at the brighter end-see figure B.

If the system is not configured properly, the dimming performance can be unsatisfactory. In figure 4, the difference in light output is quite large. And at the bright end on the right, the difference is barely noticeable. The whole dimming effect is not good.

The light level changes evenly with the dimmer position. The result of a much better implementation of a lighting system is shown in figure 5.

To achieve perfect dimming performance, the brightness of the LED must be matched to the way our eyes behave. With a linear dimmer, a logarithmic dimming curve should be used in the driver.


(Image & Video Source: Euchips)

Disclaimers of Warranties
1. The website does not warrant the following:
1.1 The services from the website meets your requirement;
1.2 The accuracy, completeness, or timeliness of the service;
1.3 The accuracy, reliability of conclusions drawn from using the service;
1.4 The accuracy, completeness, or timeliness, or security of any information that you download from the website
2. The services provided by the website is intended for your reference only. The website shall be not be responsible for investment decisions, damages, or other losses resulting from use of the website or the information contained therein<
Proprietary Rights
You may not reproduce, modify, create derivative works from, display, perform, publish, distribute, disseminate, broadcast or circulate to any third party, any materials contained on the services without the express prior written consent of the website or its legal owner.

Lumileds introduced the LUXEON CZ Color Line, a product line optimized to deliver maximum punch. “The LUXEON CZ features up to 48% higher punch than any other undomed color LED,” said Jennifer Holland, Product Line Direct... READ MORE

LG Innotek today announced that it has supplied UV LED module for water purifiers to the famous Japanese purifier manufacturer for the past year and achieved the perfect quality of zero defect rate.