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# Building America Research - page 34 / 66

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If a comprehensive lighting plan has not been developed for the Prototype house, and only fluorescent, LED, and incandescent lamps are installed, then a simplified approach may be used to estimate energy savings compared to the Benchmark using Equations 14–16. These equations use default assumptions for lamp and fixture characteristics, and it is assumed that the more efficient lamps are first applied to the room types with the highest average daily use.

Equation 14: Prototype interior hard wired lighting (kWh/yr) = LHW × [(FInc,HW+0.14) + (FCFL,HW-0.14) × 0.27 + FLED,HW × 0.16 + FLF,HW × 0.17] × SAF

where:

L F F HW Inc,HW CFL,HW

= hard-wired interior lighting for the Benchmark from Equation 10 (kWh/yr) = fraction of hard-wired interior lamps in the prototype that are incandescent = fraction of hard-wired interior lamps in the prototype that are compact

# fluorescent

F

LED,HW

F

LF,HW

= fraction of hard-wired interior lamps in the prototype that are LED = fraction of hard-wired interior lamps in the prototype that are linear

fluorescent

SAF

= Smart replacement algorithm factor: 1.4 × FInc4 - 2.4 × FInc3 + 1.7×FInc2 - 0.7 × FInc

+1

# Prototype garage lighting (kWh/yr) =

LGAR

× [(FInc,GAR

+0.14) + (FCFL,GAR

• -

0.14) × 0.27 + FLED,GAR

× 0.16 + FLF,GAR

× 0.17]

where:

L F F F F GAR Inc,GAR CFL,GAR LED,GAR LF,GAR

= garage lighting for the Benchmark from Equation 12 (kWh/yr) = fraction of lamps in the garage that are incandescent = fraction of lamps in the garage that are compact fluorescent = fraction of lamps in the garage that are LED = fraction of lamps in the garage that are linear fluorescent

# Prototype outdoor lighting (kWh/yr) =

LOUT

× [(FInc,OUT

+0.14) + (FCFL,OUT

• -

0.14) × 0.27 + FLED,OUT

× 0.16 + FLF,OUT

× 0.17]

where:

L F F F F OUT Inc,OUT CFL,OUT LED,OUT LF,OUT

= outdoor lighting for the Benchmark from Equation 13 (kWh/yr) = fraction of outdoor lamps that are incandescent = fraction of outdoor lamps that are compact fluorescent = fraction of outdoor lamps that are LED = fraction of outdoor lamps that are linear fluorescent

# Option 2:

The Benchmark and Prototype lighting energy use for Option 2 are both calculated using the BA Analysis Spreadsheet found online. The Benchmark uses fixed values for peak illumination levels (Table 18), operating hours per day per room (Table 22), average efficacies for a given room type, fraction of hard-wired lighting per room type, and primary fixture type (Table 17). All other parameters are user inputs that are used by both the Benchmark and the Prototype.

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