9.6.2 Additional Interior Lighting Power
When using the Space-by-Space Method, an increase in the interior lighting power allowance is allowed for specific lighting functions. Additional power shall be allowed only if the specified lighting is installed and automatically controlled, separately from the general lighting, to be turned off during nonbusiness hours. This additional power shall be used only for the specified luminaires and shall not be used for any other purpose unless otherwise indicated.
An increase in the interior lighting power allowance is permitted in the following cases:
- For spaces in which lighting is specified to be installed in addition to the general lighting for the purpose of decorative appearance or for highlighting art or exhibits not exempted in Section 188.8.131.52. Exception 1, provided that the additional lighting power shall not exceed 0.75 W/ft2 of such spaces.
- For lighting equipment installed in sales areas and specifically designed and directed to highlight merchandise, calculate the additional lighting power as follows:
Additional Interior Lighting Power Allowance =
1000 W + (Retail Area 1 × 0.45 W/ft2) + (Retail Area 2 × 0.45 W/ft2)
+ (Retail Area 3 × 1.05 W/ft2) + (Retail Area 4 × 1.88 W/ft2)
|Retail Area 1||=||the floor area for all products not listed in Retail Areas 2, 3, or 4|
|Retail Area 2||=||the floor area used for the sale of vehicles, sporting goods, and small electronics|
|Retail Area 3||=||the floor area used for the sale of furniture, clothing, cosmetics, and artwork|
|Retail Area 4||=||the floor area used for the sale of jewelry, crystal, and china|