Energy & Sustainability
LED Lighting Upgrade Savings
Calculate energy savings and payback period when replacing conventional lighting (fluorescent, HPS, metal halide) with LED technology.
Units:
Modern LED technology achieves 120–180 lm/W compared to 60–90 lm/W for fluorescent and 80–120 lm/W for metal halide. LED lifetime: 50,000–100,000 hours vs. 8,000–20,000 for conventional. Include maintenance cost savings in your ROI calculation.
Saving [kWh] = (P_old − P_new) × hours | ROI includes energy + maintenance savings
Input
Number of fixtures iTotal number of light fixtures to be replaced.
units
Power per fixture (old) iPower consumption of each existing fixture including ballast in Watts.
W
Power per fixture (LED) iPower consumption of each new LED fixture in Watts.
W
Annual burning hours iAnnual operating hours of the lighting system.
h/year
Energy price iIndustrial electricity tariff in €/kWh.
€/kWh
Investment per fixture (LED) iPurchase and installation cost per LED fixture in €.
€
Maintenance saving per year iAnnual maintenance/lamp replacement cost savings (labour + materials) in €.
€
Result
Total power (old) [kW]
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Total power (LED) [kW]
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Annual energy saving [kWh/year]
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Annual energy cost saving [€/year]
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Total annual saving (energy + maint.) [€/year]
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Total investment [€]
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Payback period [months]
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