The National Electrical Manufacturers Association (NEMA) has published LSD 49-2010 “Solid State Lighting for Incandescent Replacement—Best Practices for Dimming”.

Produced by NEMA’s Solid State Lighting Section, this paper provides
recommendations for the dimming and design of screw-based incandescent
replacement solid-state lighting (SSL) products. The main objective is
to encourage coordination among control, power supply and LED module
manufacturers to achieve desired performance and product harmonization
throughout the market. The section has also begun work on a related NEMA
standard.

Because of the shared concern for high levels of performance and SSL
consumer market acceptance, representatives from the U.S. Department of
Energy are actively participating in NEMA’s working group devoted to
this subject.

“In making these recommendations, our goal is to improve performance and
to increase consumer satisfaction of SSL retrofit products in the large
installed base of Edison sockets,” said Robert Hick of Leviton
Manufacturing, who chairs the responsible NEMA section. “Achieving these
goals will further market acceptance of SSL products and encourage
demand for new SSL product designs. Both interchangeability and
harmonization tend to increase market acceptance while decreasing costs,
benefiting manufacturers and consumers.”

CLICK HERE to download LSD 49 at no charge (you will, however, have to
register).