Grow light running cost calculator (UK)
Calculate weekly, monthly and yearly grow-light electricity cost from watts, hours and your own pence-per-kWh rate.
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How to use the result
Record the inputs beside the output. That makes the result reproducible and helps you compare a change in light hours, reservoir size or nutrient dose without relying on memory.
For electricity, use the unit rate from your own bill. For nutrients, enter the dose printed on the product label. The system picker is a simple heuristic, not a promise of crop performance.