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FAQs about MRc4 :

How do you know if a lamp meets the NEMA guidelines, and can therefore be excluded?

The project building includes a significant amount of process lighting (i.e. sports arena lighting or studio lighting). Do these lamps need to be included?

There are no mercury-containing lamps installed in the project building. Can we upload a signed statement from our property manager instead of completing the credit form and documentation?

A large multi-tenant project does not have a uniform lighting standard, therefore there are a number of different types of lamps are installed on the project. How should we go about documenting this credit?

Do we need to provide a purchasing plan if the lamp inventory of currently installed lamps shows that the average mercury content is already below 90 picograms per lumen-hour?

Do lamps for task lighting need to be included in the purchasing plan?

Do mercury-free lamps need to be included in Table MRc4-1 Lamp Purchasing Plan and Table MRc4-2 Performance Period Lamp Purchasing?

All of the outdoor fixtures in the project building are mercury-free. Can we exclude all outdoor fixtures from the purchasing plan?

The project building is a large multi-tenant building and tenants are responsible for their own lamp purchases. Can lamps in tenant spaces be excluded?

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Forum discussion

EBOM-2009 MRc4:Sustainable Purchasing—Reduced Mercury in Lamps

Which Rated Life per bulb is to be used in calculations?

I found the following life values in the Bulb specifications. Which rated life is to be used in the LEEDOnline form for this credit? Life to 10% failures EM = 6500 hr Life to 10% fail Preheat EL, 3h = 8000 hr Life to 10% fail Nonpreh EL, 3h = 4500 hr Avg. Life = 10000 hr Rated Avg. Life = 12000 hr Life to 50% fail Nonpreh EL, 3h = 7000 hr (The use of Avg. Life of 10000 hrs by the Philips calculator in the toolkit is a bit confusing)

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Bill Swanson
Sr. Electrical Engineer
Integrated Design Solutions
LEEDuser Expert
516 thumbs up

Thu, 06/12/2014 - 19:06

Life to 50% fail Nonpreh EL, 3h = 7000 hr This is the value that should be used. I have no idea what they mean by "Ave. Life" and "Rated Avg. Life". I'd guess The first three lines (measured to 10% failures) are likely similar to the last 3 lines (measured to 50% failures). Line 1 & 4 are the same test method, 2 & 5 are the same, and then 3 & 6 are the same. I'll bet "Ave. Life" was never turned off. The lights were always on and they measured them until 50% failed. "Rated Avg. Life" would then be the 3 hours on at a time using the programmed ballast.

Thu, 06/12/2014 - 19:11

Thanks for the help Bill. The Philips calculator doesn't match the values that appear in the LEEDOnline form if I use the 7000 hr value, hence the confusion. I will use the 7000 hr value and upload the manufacturer's specifications. We need to upload the cutsheets or similar documentation only for 20% of the bulbs we purchased during the performance period or for all those which are included in the performance purchasing plan?

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