Lamp and Ballast Replacement for Energy Efficiency
Relamping means substituting one lamp for another to save energy. You can decide to make illumination higher or lower when relamping. Be sure that the new lamp's lumen output fits the tasks performed in the space and conforms to the fixture's specifications.
Matching replacement lamps to existing fixtures and ballasts can be tricky, especially with older fixtures. Buying new fixtures made for new lamps produces superior energy savings, reliability, and longevity compared with relamping.
For more information, see these resources:
Before replacing a lamp and/or ballast in a light fixture, it's a good idea to first understand basic lighting principles and terms. This understanding will help you make the most economical purchase.