Lighting Layout Estimator Estimate number of fixtures needed to light an indoor area to a specified light level (meter-candle level). SEE INSTRUCTIONS AT BOTTOM. INPUT Area to be lit (sq, mt.) Footcandles desired Fixture Watts No. of lamps per fixture Rated Mean Lumens per lamp Ballast Factor (BF) Burning hours per year Electricity rate (R per kWh) Coefficient of Utilization (CU) Estimated no. of fixtures Estimated no. of lamps Estimated fixture spacing Total kW load Energy cost per year Watts per square foot INSTRUCTIONS: Enter the correct numbers in the gray cells and press "Calculate". For an explanation of the terms "Ballast Factor" and "Coefficient of Utilization," please click on the labels. Note that this estimator does include the effects of ballast factor and lumen depreciation but does not include Light Loss Factors (LLF) from ambient temperature, voltage, dust, tarnishing etc.. Copyright ©2004 R & D Electronics All Rights Reserved