scope:

This paper focuses on integrated LED lamps intended for replacement of general service incandescent lamps. Future white papers are planned to address other LED dimming topics, such as: color change; light output and efficiency (dimming curve); dimming protocols (Internet protocols, 0-10); LED modules with auxiliary drivers; and control architectures that dim without modulated power.

LEDs have become a popular light source because of their unique combination of characteristics: potential for excellent color rendering, energy efficiency, compact size, low voltage, and long life. Standards do not yet exist to guide the industry to develop consistent and cost-effective control of integrated LED lamps. Such standards will be required for widespread adoption. This paper provides a framework for discussing the issues and promotes the creation of an industry standard for LED dimming control.

The main objective for this paper is to encourage coordination among control, power supply, and LED module manufacturers to achieve desired performance. This effort may end up divided into (1) power supplies and integrated light sources designed for retrofit to existing incandescent dimmer sockets, and (2) power supplies and controls for new installations. The latter may achieve a simpler solution for the power supply if more intelligence is put into the control (dimmer). This must be coordinated within the industry; otherwise, there may be as many incompatible solutions as there are manufacturers, which will slow marketplace acceptance.

The large installed base of dimmer controls needs to be effectively included in any solution, so it is possible that more complexity must go into the power supply or integrated light source.