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CS-2009 EAp2:Minimum Energy Performance

illuminance level of lighting power density of ashrae 90.1

ashrae 90.1 give the LPD of different space. But i want to know what the correspondent illuminance level is. if there is a project whose illuminance level is higher than the ashrae 90.1,the lighting power is higher accordingly. but the baseline model use the LPD of ashrae 90.1 which correspond the lower illuminance level .it is unfair to our project. what do you think?

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Thu, 05/30/2013 - 14:40

IESNA worked with ASHRAE to develop the lighting power density values. It is assumed that the LPD can be delivered while meeting the IESNA recommendations for illuminance. The amount of illuminance is not covered by 90.1, that is up to your local/project requirements.

Fri, 05/31/2013 - 02:05

Thanks for your reply. but there is one point i do not know well. For example the LPD of 90.1 for office is 12w/m2 in baseline modeling,corresponding 400 LUX .but our project is 500LUX and the lighting power is 14w/m2 higher accordingly. can we adjust the LPD of office to 11.2 in proposed modeling multiplied by 0.8?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 05/31/2013 - 14:57

No you cannot adjust the baseline LPD because you have a higher illuminance level.

Mon, 06/03/2013 - 09:29

According to your reply,the baseline LPD cannot be adjusted. but i want to ask whether the proposed LPD can be adjusted. For example the LPD of 90.1 for office is 12w/m2 in baseline modeling,corresponding 400 LUX .but our project is 500LUX and the lighting power is 14w/m2 higher accordingly. can we adjust the proposed LPD of office to 11.2 in proposed modeling multiplied by 0.8?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 06/03/2013 - 13:54

No the proposed must be modeled as designed, without any adjustment. If you choose to increase light levels the actual wattage must be modeled.

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