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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

Life of lamp

Tam Kin Hung

LEEDuser Basic Member

3 thumbs up

September 27, 2013

Refer to the reference guide, the test condition of life of lamp is 3 hours on for every 20 minutes off for fluorescents, 11 hours on for high-intensity discharge lamps. Does it mean the high-intensity discharge lamps must meet the reuqirements of 11 hours on for every 20 min off?According to IEC 61167;1998, the lamps are tested 11 hours on every 1 hour off. Wondering if the requirement in LEED is more strict than IEC?

Post a reply

Bill Swanson

Sr. Electrical Engineer

Integrated Design Solutions

LEEDuser Expert

516 thumbs up

Fri, 09/27/2013 - 12:45

The reference guide never said 20 minutes off for HID. If the standard test practice is 11-hours on and 1-hour off then use that.

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