For questions regarding lighting that uses LED (Light Emitting Diode) technology.

Questions that relate to the use of LED bulbs and fixtures, their selection and use.

This is not for LEDs that are part of much larger pieces of equipment such as TVs, clocks and similar.

LEDs are solid state devices that convert electric potential (voltage) into light output. They are some of the most efficient sources of light available and, although expensive, are preferred to incandescent bulbs and compact fluorescent bulbs as the former are notoriously inefficient and the latter contain elemental mercury (environmental hazard if broken).

Unlike CFLs and incandescents, LEDs do not need a glass envelope to contain their functioning parts, but are made of plastic. This makes them much more durable and almost impossible to shatter.

There does not seem to be an industry trade group dedicated to LEDs or their manufacturers, but Wikipedia has a good page on the subject: