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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

MRc4 Exemplary Performance Threshold

Can anyone tell me where the 50 pg/l-h threshold for exemplary performance came from? This is what LEED reviewers are using, I just am having trouble figuring out where this originated from since the reference guide says 70 pg/l-h and there are no addenda that I can find saying otherwise. Thanks!

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Profile picture for user jfranken
Jason Franken
Sustainability Professional
LEEDuser Expert
430 thumbs up

Fri, 05/04/2012 - 21:19

Is your project registered under v2008 or v2009? The EP threshold was 50 pg/lumen-hour in the v2008 rating system, but that was also when there were 2 points available under MRc4. When they revised the credit in the v2009 rating system, they made the credit worth one point (with the minimum threshold at 90 pg/lumen-hour) and set the EP threshold at 70 pg/lumen-hour. If you're working on a v2009 project and the reviewer is trying to claim that the EP threshold is 50, it's definitely within your purview to point out that they are not observing the current credit language (politely, of course).

Mon, 05/07/2012 - 16:03

The project is registered under the 2009 rating system and we were under the 50 threshold anyway. I just wanted to make sure that for future 2009 projects I am communicating the correct thresholds to clients. Thanks!

Thu, 06/07/2012 - 03:57

A Little Confused... EBOM v2009 The reference guide states: 'one point is awarded to projects for which at least 90% of all mercury-containing lamps comply with plan and target of 90 picograms per lumen hour.' p283. Then on p288, it states: ' Project teams can earn an additional point if 90% of lamps purchased over the performance period have an average mercury content of 70 picograms per lumen hour or less.' Please clarify if there is a typo or if I am confused. Thanks!
Profile picture for user michael.smithing
Michael Smithing
Director - Green Building Advisory
Colliers International Ltd.
LEEDuser Basic Member
201 thumbs up

Thu, 06/07/2012 - 07:00

The extra exceptional performance point is for purchasing lamps which exceed the credit requirement of 90 picogram/lumen hour and average of 70 picogram/lumen hour or less.

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