☀️ Closed-Loop / Open-Loop Photosensors, 0-10V / DALI Continuous Dimming (1-100%)

Commercial Daylight Harvesting Calculator

Model automatic daylight harvesting energy savings along commercial window perimeters under Title 24 & ASHRAE 90.1: calculate continuous photosensor dimming (smoothly reducing electric lighting down to 1-10% as natural foot-candles enter secondary sidelit zones), saving 40-65% perimeter lighting kWh, and lighting retrofit ROI.

1. Project & Operating Inputs

Perimeter Daylight Zone Area (Square Feet e.g. 24,000 Sq Ft)

Baseline Lighting Power Density (Watts / Sq Ft e.g. 0.70 W/SqFt)

Turnkey Photosensor Dimming Controls Retrofit CapEx ($)

Facility Electricity Rate ($ / kWh e.g. $0.16/kWh)

2. Financial Breakdown & Yield

DAYLIGHT HARVESTING SAVINGS

5-Year Perimeter Lighting Energy Savings

Photosensor Dimming Retrofit ROI

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost