Mercury vapor lamps are an old type of high intensity discharge (HID) lamp that are less efficient than the now widely used metal halide and high pressure sodium lamps. However, these lamps continue to be used, both in existing fixtures and in some applications where the lower cost of mercury vapor lamps and ballasts are attractive to purchasers, despite their higher energy use. In 2005, Congress passed a law banning sale of mercury vapor ballasts as of 2008. No new fixtures can be sold, and as existing ballasts burn out, they must be replaced with other lamp types.
Mercury Vapor Lamp Ballasts
Mercury Vapor Lamp Ballast Standards of 2005
Savings through what year?:
Energy saved (quads):
CO2 savings (million metric tons):
Net present value savings ($billion) 3% discount rate:
Net present value savings ($billion) 7% discount rate:
|1st Federal Standard Effective||2008|
|2007||RI Standard Effective|
|EPACT Initial Federal Legislation Enacted||2005|
|2005||RI Standard Adopted|
|1st Federal Standard Adopted (Congress)||2005|
Timeline reflects state standards from 2001 to present; federal standards from inception to present.