Defaults to a recent US residential average. Edit to match your bill.
The math:
Wattage = Area × Watts per sq ft (tier range)
Daily cost = (Watts ÷ 1000) × Hours × Rate
Recommended wattage
225–315 W
actual input watts
Estimated cost
$0.68/day
~$20.41/month
Rule-of-thumb ranges for home growing setups, not a professional lighting design.
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