What does it cost to run a grow tent? Enter your light wattage, hours per day, and local electricity rate for exact daily, monthly, and per-harvest running costs. A 400W LED on 18/6 at $0.12/kWh runs about $26/month; a 600W setup about $39/month, plus $5–15/month for fans. Startup equipment for a 4x4 tent (light, tent, ventilation) runs roughly $450–800 one time. Over a ~4-month cycle most home growers spend $150–350 in electricity and consumables — well under dispensary prices for the same flower.
A 400W LED on 18 hours a day at $0.12/kWh costs about $26/month; a 600W setup about $39/month. Add $5–15/month for fans plus nutrients and medium per cycle.
Multiply total wattage by hours per day divided by 1000 for daily kWh. A 400W light on 18/6 uses ~7.2 kWh/day (≈216 kWh/month); fans running 24h add more.
Startup for a 4x4 tent is ~$450–800. After that it is mostly electricity (~$25–45/month for the light) plus nutrients and medium — roughly $150–350 per 4-month cycle.
A single 400–600W LED adds a modest $25–45/month. Modern LEDs draw far less than old HPS setups; the calculator shows your exact monthly and per-harvest cost.
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