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High Efficiency Office: Low Ambient/ Task Lighting Pilot Project

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6.3 Peak Demand<br />

Heschong Mahone Group, Inc.<br />

Pacific Gas and Electric Company<br />

Emerging Technology <strong>Low</strong> <strong>Ambient</strong>/<strong>Task</strong> <strong>Lighting</strong> <strong>Pilot</strong>s<br />

Weekday Peak demand was reduced by 0.8W/sf, from 1.42W/sf down to 0.62 (see Figure<br />

16). Note that the peak demand actually occurred from 10-11am, which is outside<br />

PG&E’s “peak period”. During the “peak period”, the reduction in lighting wattage was<br />

0.69W/sf.<br />

1.4<br />

1.2<br />

1.0<br />

0.8<br />

0.6<br />

0.4<br />

0.2<br />

0.0<br />

Encon Total Overhead <strong>Lighting</strong> Wattage Pre and Post<br />

Retrofit<br />

Weekday Pre<br />

Weekend Pre<br />

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24<br />

Hour<br />

Figure 16. Peak Demand Profiles Pre and Post Retrofit<br />

19<br />

Weekday Post<br />

Weekend Post

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