Independent lighting tool
LED Bulb Lumens, Watts, Energy-Cost & Payback Comparator
Compare an existing lamp and LED using actual package or datasheet values.
Step 2
Comparison
Enter both lamps and usage to compare.
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Annual electricity-cost difference
—- Existing energy
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- LED energy
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- Existing cost
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- LED cost
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- Existing efficacy
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- LED efficacy
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- Simple payback
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- Brightness difference
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Existing total: — · LED total: —
How it works
Annual energy = watts × quantity × daily hours × days/year ÷ 1000. Payback uses positive purchase difference and annual electricity-cost savings.
Limits
Lumens measure light output; watts measure power. Beam angle, colour quality, dimmer compatibility and actual lamp life are separate decisions.