Daylight Harvesting Savings Calculator

Calculate how much energy daylight harvesting photosensors will save by automatically dimming lights when natural daylight is available. Savings vary significantly by orientation and climate.

Window orientation
S
South
Best savings
N
North
Diffuse light
E
East
Morning sun
W
West
Afternoon sun
Space details
Used to calculate daylight zone depth
Lighting and operating hours
Typical office: 0.6-1.0 W/sq ft
Climate and system
Photosensors + dimming controls

Please enter room dimensions.

Annual energy savings
$0
0
kWh saved/year
0%
Energy reduction
0
Payback period
Daylight availability by month
Daylight zone plan
Total room area
Daylight zone area
Daylight zone load
Annual daylight hours available
Avg dimming level during daylight
Annual kWh saved
10-year net savings
Cumulative net savings
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The calculators and tools on LightingCalc.lighting are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. LightingCalc.lighting makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.