How Much Does It Cost to Run a Grow Lights?
A typical Grow Lights uses 300W and runs about 12 hours/day. At the national average rate of 16.72¢/kWh, that costs approximately $18.06/month.
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What Affects the Cost of Running a Grow Lights
Grow Lights Run 12-18 Hours Per Day, Making Them Serious Energy Consumers
Unlike most appliances that run for minutes or a few hours, grow lights for indoor plants run 12-18 hours/day to simulate natural sunlight. A 300W LED grow light running 14 hours/day uses 126 kWh/month, costing about $21 at the national average rate. Multiple lights for a larger grow area multiply this proportionally. An indoor garden with 1,000W of grow lighting costs $70+/month.
LED Grow Lights Use 40-60% Less Electricity Than HPS
High-pressure sodium (HPS) lights were the standard for indoor growing but generate enormous heat and waste energy. LED grow lights produce the specific light wavelengths plants need with far less wasted energy. Replacing a 600W HPS light with a 300W LED that covers the same area cuts electricity costs by 50% while reducing heat (and the associated cooling costs) as well.
Grow Lights vs. Alternatives
How the monthly cost of a Grow Lights compares to other options:
| Alternative | Est. Monthly Cost | Notes |
|---|---|---|
| Grow Lights (this page) | $18.06 | At national average rate, 12hrs/day |
| LED grow light (300W) | ~$18-25 | Most efficient option. Less heat, targeted spectrum. |
| HPS grow light (600W, equivalent output) | ~$40-55 | 2x the electricity plus additional cooling costs from heat output. |
| Fluorescent grow light (T5) | ~$8-15 | Good for seedlings and low-light plants. Not powerful enough for fruiting plants. |
| Natural sunlight (window or greenhouse) | $0 | Free but limited by season, latitude, and window orientation. |
Grow Lights Cost by State
What a Grow Lights costs to run at 300W for 12 hours/day in every state:
| State | Rate | Monthly Cost | Yearly Cost |
|---|---|---|---|
| Alabama | 14.82¢ | $16.01 | $192.07 |
| Alaska | 25.34¢ | $27.37 | $328.41 |
| Arizona | 13.81¢ | $14.91 | $178.98 |
| Arkansas | 12.63¢ | $13.64 | $163.68 |
| California | 31.41¢ | $33.92 | $407.07 |
| Colorado | 15.24¢ | $16.46 | $197.51 |
| Connecticut | 29.35¢ | $31.7 | $380.38 |
| Delaware | 15.24¢ | $16.46 | $197.51 |
| District of Columbia | 15.87¢ | $17.14 | $205.68 |
| Florida | 15.63¢ | $16.88 | $202.56 |
| Georgia | 14.12¢ | $15.25 | $183 |
| Hawaii | 43.21¢ | $46.67 | $560 |
| Idaho | 10.87¢ | $11.74 | $140.88 |
| Illinois | 16.37¢ | $17.68 | $212.16 |
| Indiana | 15.12¢ | $16.33 | $195.96 |
| Iowa | 14.23¢ | $15.37 | $184.42 |
| Kansas | 14.98¢ | $16.18 | $194.14 |
| Kentucky | 12.87¢ | $13.9 | $166.8 |
| Louisiana | 11.98¢ | $12.94 | $155.26 |
| Maine | 22.87¢ | $24.7 | $296.4 |
| Maryland | 16.12¢ | $17.41 | $208.92 |
| Massachusetts | 28.76¢ | $31.06 | $372.73 |
| Michigan | 18.76¢ | $20.26 | $243.13 |
| Minnesota | 15.34¢ | $16.57 | $198.81 |
| Mississippi | 13.76¢ | $14.86 | $178.33 |
| Missouri | 13.12¢ | $14.17 | $170.04 |
| Montana | 12.45¢ | $13.45 | $161.35 |
| Nebraska | 11.98¢ | $12.94 | $155.26 |
| Nevada | 15.03¢ | $16.23 | $194.79 |
| New Hampshire | 25.34¢ | $27.37 | $328.41 |
| New Jersey | 18.76¢ | $20.26 | $243.13 |
| New Mexico | 14.87¢ | $16.06 | $192.72 |
| New York | 22.87¢ | $24.7 | $296.4 |
| North Carolina | 13.98¢ | $15.1 | $181.18 |
| North Dakota | 11.87¢ | $12.82 | $153.84 |
| Ohio | 15.34¢ | $16.57 | $198.81 |
| Oklahoma | 11.98¢ | $12.94 | $155.26 |
| Oregon | 13.12¢ | $14.17 | $170.04 |
| Pennsylvania | 16.87¢ | $18.22 | $218.64 |
| Rhode Island | 27.12¢ | $29.29 | $351.48 |
| South Carolina | 14.98¢ | $16.18 | $194.14 |
| South Dakota | 13.76¢ | $14.86 | $178.33 |
| Tennessee | 12.87¢ | $13.9 | $166.8 |
| Texas | 14.98¢ | $16.18 | $194.14 |
| Utah | 10.87¢ | $11.74 | $140.88 |
| Vermont | 21.34¢ | $23.05 | $276.57 |
| Virginia | 15.34¢ | $16.57 | $198.81 |
| Washington | 10.76¢ | $11.62 | $139.45 |
| West Virginia | 13.12¢ | $14.17 | $170.04 |
| Wisconsin | 16.98¢ | $18.34 | $220.06 |
| Wyoming | 11.23¢ | $12.13 | $145.54 |
Energy-Saving Tips for Your Grow Lights
- LED grow lights use 40-60% less energy than HPS (high-pressure sodium) for the same output
- Use a timer to maintain consistent light cycles and avoid waste
- Position lights at the recommended distance; too far wastes light, too close wastes energy as heat
- Match the wattage to your growing area; oversized lights waste energy
Frequently Asked Questions
A 300W LED grow light running 14 hours/day costs about $21/month at the national average rate. A 600W HPS light for the same growing area costs about $42/month. For a small herb garden with a 100W light, monthly cost is about $7. The key variables are wattage and daily run hours. Indoor growing is a meaningful electricity expense.
Yes. LED grow lights cost more upfront ($150-$400 vs $50-$150 for HPS) but save 40-60% on electricity. For a 300W LED replacing a 600W HPS, the monthly savings are about $20. The LED pays for its price premium in 6-12 months of electricity savings. LEDs also last 50,000+ hours (10+ years at 14 hours/day) versus 10,000-20,000 hours for HPS.
Vegetative growth plants (herbs, leafy greens): 14-18 hours/day. Flowering/fruiting plants: 12 hours/day. Seedlings: 16-18 hours/day. More hours means more electricity, so use a timer to automate the cycle precisely. Running lights 24 hours is not beneficial for most plants (they need a dark period) and wastes 30-40% more electricity than an optimized schedule.
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Electricity cost estimates are based on typical wattage and average residential rates from the U.S. Energy Information Administration. Your actual costs may vary based on your appliance's specific wattage, usage patterns, and your utility's rate structure. See our full disclaimer.