Healthcare MRc4.1: rated hours for lamps or ballasts?

December 10, 2013

Megan Shelby

Skidmore, Owings & Merrill

LEEDuser Basic Member

1 thumbs up

December 10, 2013

For LEED-Healthcare MRc4.1, can you confirm that the rated hours criteria is for the lamp or the ballast? For example, the criteria for a T-5 lamp is "25,000 rated hours on program start ballasts." Does the lamp or the program start ballast need to have a rated life of at least 25,000 hours?

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Giulio Pedota

Principal
Schuler Shook

LEEDuser Basic Member

December 18, 2013 - 4:58 pm

Megan,
If the 25,000 rated hours is on the program start ballast, and not the lamp, then most ballast’s life expectancy is 50,000 hours (manufacturers will actually tell you the life expectancy is doubled for every 10°C reduction in ballast case operating temperature). Did you ever clarify this issue completely? Thanks, Giulio