How Much Does It Cost to Run Grow Light?
A 600-watt-class grow light on a 12-hour cycle is one of the few hobby loads that rivals major appliances — the light bill is part of the grow budget. At the US-average rate of 16.5¢/kWh, running a grow light costs about $36.09/month ($433.09/year) at typical use. Adjust the watts, hours, and your rate below for your exact number.
Cost to run a grow light
$433/yr
- Per day
- $1.19
- Per month
- $36.09
- Energy per year
- 2,628 kWh
Cost = power (kW) × hours × days × your rate. Defaults are typical values — enter your appliance's actual watts (often on a label) and your real rate for a precise figure.
Cost to run a grow light by electricity rate
Same 600 W appliance, 12 h/day — the bill changes with where you live.
| Scenario | Rate | Per month | Per year |
|---|---|---|---|
| Cheapest states (North Dakota) | 11.5¢ | $25.21 | $302.48 |
| US average | 16.5¢ | $36.09 | $433.09 |
| Most expensive (Hawaii) | 42.9¢ | $93.86 | $1,126.36 |
Find your state's rate on the electricity rates by state page, or see the appliance wattage chart for more devices.
Frequently asked questions
Ask AI about this
Open an AI assistant with a question grounded in this page.