Lighting Retrofit Savings Calculator
Estimate annual energy and maintenance savings, net project cost, and simple payback for a lighting replacement.
Enter project values
Retrofit savings estimate
About this calculator
Estimate annual energy and maintenance savings, net project cost, and simple payback for a lighting replacement.
Assumes the replacement provides acceptable lighting for the same use. It does not verify illumination, controls, life-cycle degradation, financing, tax treatment, or utility incentive eligibility.
Method and assumptions
Annual energy savings = (existing watts − replacement watts) × fixture count × operating hours × operating days ÷ 1,000. Annual net savings adds energy-cost savings and maintenance savings. Simple payback = net project cost after rebate ÷ annual net savings when annual net savings are positive.
Results use only the user-entered prices, rates, equipment power, efficiencies, and operating schedule. They are estimates for comparison, not a bid, guarantee, or project approval.
FAQs
Are the prices or energy rates prefilled market averages?
No. Enter current project quotes, your applicable electricity rate, maintenance estimates, and operating assumptions.
Does this prove the alternatives are technically equivalent?
No. Check electrical ratings, conductor suitability, equipment listings, photometric results, and manufacturer instructions separately.
Sources
Use current supplier quotations, utility tariff information, equipment data, and project operating records for the values entered.