# 90.1 - lighting - Additional interior lighting power using non-mandatory control

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Hello,

Does anybody have to deal with section 9.6.3 from 90.1 - 2013 : "Additional interior lighting power using non-mandatory control"? I find it unclear ( it's pretty much the same section than section 9.6.2 c in the 2010 version).

It says that :
Additional Interior Lighting Power Allowance =
Lighting Power Under Control x Control Factor

1) I have a hard time to figure it out what is "Lighting Power Under Control", is it a power or a surface ?
According to section 9.6.3 it is a power: "the total input watts of all lamps being controlled" by specific control, but according to example 9-MM of 90.1 - 2013 User's Manual, it's much more the surface (in m2 or ft2) lighted by all lamps being controlled by specific control.

2) What is "Control Factors", a unitless factor or a LPD in W/m2 ?

According to section 9.6.3 it's a unitlessfactor, but according to example 9-MM of 90.1 - 2013 User's Manual, it's much more a LPD (see note).

3) In a theoretical example following section 9.6.3 of 90.1-2013 what should be the power allowance for an 550 ft2 open office in which there is a 150 ft2 with a manual diming control (Control Factor = 0.05 according to table 9.6.3 and maximum LPD for an open office is 0.98 W/ft2 LPD according to section 9.6.1) ? Is it answer A, B, or another one ?

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A) Power allowance = (550 ft2 x 0.98 W/ft2) + (150 ft2 x 0.98 W/ft2 x 0.05) = 539 + 7.35 = 546.35 W

B) Power allowance = (550 ft2 x 0.98 W/ft2) + (180 W x 0.05) = 539 + 9 = 548 W

Note about example 9-MM of 90.1 - 2013 User's Manual: this example is full of mistakes.

? It refers to example 9-JJ instead of 9-LL

? The answer mentions an allowance without control of 450,000 W, so with a 500,000 ft2 open office that's mean a 0.90 W/ft2 LPD. But with the space-by-space method section 9.6.1 allows a 0.98 W/ft2 LPD, so the allowance without control should be 459,184 W

? The use of the control factors is unclear

Any help on that would be appreciated
Thanks,

Julien Dutel, ing., CEM, CMVP.
Direction des secteurs r?sidentiel, institutionnel et des affaires
Bureau de l'efficacit? et de l'innovation ?nerg?tiques
Minist?re des Ressources naturelles
5700, 4e Avenue Ouest, B-406
Qu?bec (Qu?bec) G1H 6R1
T?l?phone : 418 627-6379, poste 8060
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http://www.efficaciteenergetique.mrn.gouv.qc.ca

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