How it works
Payback years = upgrade cost ÷ annual electricity saving.
Input definitions
- Old lamp watts
- Enter the value in the labeled unit.
- LED watts
- Enter the value in the labeled unit.
- Number of lamps
- Enter the value in the labeled unit.
- Hours used per day
- Enter the value in the labeled unit.
- Electricity price per kWh
- Enter the value in the labeled unit.
- Upgrade cost
- Enter the value in the labeled unit.
A worked example
- Old lamp watts
- 60
- LED watts
- 9
- Number of lamps
- 20
- Hours used per day
- 5
- Electricity price per kWh
- 0.25
- Upgrade cost
- 120
Assumptions & limits
Uses only the values entered. Rates are illustrative inputs, not live quotes, legal rules or personalised advice. Check provider terms, local requirements and measurements before acting.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-19. Content checked against the stated method and examples. Our verification approach.
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Common questions
What other benefits are omitted?
Longer lamp life and reduced cooling load can add savings; light quality and fixture compatibility also matter.
How does LED lighting upgrade payback calculate the result?
Payback years = upgrade cost ÷ annual electricity saving.
What should I verify before using LED lighting upgrade payback?
Uses only the values entered. Rates are illustrative inputs, not live quotes, legal rules or personalised advice. Check provider terms, local requirements and measurements before acting.