LED vs Halogen Energy & Payback Calculator
Calculate energy savings and payback period when switching from halogen/incandescent to LED bulbs.
W
W
bulbs
hr/day
p/kWh
£
Results
Formulas
- Annual saving = (Old W − New W) × bulbs × hours × 365 / 1000 × tariff
- Payback (years) = Total LED cost / Annual saving
- Typical LED lifespan: 15,000–25,000 hours vs 1,000–2,000 for halogen