Excellent service The fixture arrived even faster than expected and in perfect condition. You will need to provide service switchgear to cover these, even if the tenants are separately metered. Are you sure you want to delete this answer?clay poker chips casino TRUST A GAMBLING ADDICT Commercial Electrical Demand Estimation Customer Demand Load and Revenue Evaluations. • To estimate lighting lead, if irot provided by the customer, multiply the total square footage by 3 watts per sq. • Historical demand per square foot n Customer's load schedule and operational need. Does anybody know where to find tables with total electrical watts per square feet for different kind of buildings? I am using 15 W/kasinovegasx61c.xyz for office buildings and 30 W/kasinovegasx61c.xyz for restaurants. But what should I use for new hospital building or some. Compare the watts per square foot for two different lighting systems. × Featured Content» Current Articles» Watts Per Square Foot Estimator.