by Nebula Haze
400W HPS Grow Setup (For Hobbyist Growers)
- Average Yields: 7-14 ounces
- Recommended 2-6 plants
- Grow space is 3’x3’x6′ or 4’x4’x6′ (bare minimum is 2’x4’x6′)
About This Setup
When you’re just starting to foray into the world of larger grow lights, a 400W HPS is an appropriate first light to try. It’s energy efficient, relatively cheap, and makes for large colas than stretch far down the plant. These light are more popular than the 250W HPS, but less than the 600W HPS, and far less popular than the current line of LEDs or LECs. Still, these lights are a workhorse and will pay for themselves quickly in any medium-sized indoor cannabis grow.
Pros: Cheap, effective, high yields and potency
Cons: Not popular, yellow spectrum is easy to spot by nosy people, some models emit RFI which can alert HAM radio users to your grow
- Total Setup Cost: $744.00
- Estimated Electricity Cost: $46-96/month (based on $0.12/kWH to $0.25/kWh – see breakdown)
- Total Cost for Entire First 4-Month Grow (Setup + Electricity): $1128 ($81-161/ounce)
- Total Cost for Second Grow (Nutrients + Electricity): $414 ($30-59/ounce)
Complete Grow Supply List
This cannabis grow room setup list includes all the supplies you need to get to harvest.
- 400W MH/HPS Grow Light
* Alternative LED Grow Light: HLG 300 R-Spec LED Grow Light (better option if heat is a concern, runs much cooler!)
- Grow Tent Recommended Sizes
- Exhaust Fan
- A quality 6″ exhaust fan works best. Avoid small cheap “booster” fans as they usually don’t have enough power to exhaust all the hot air effectively. Hang from inside tent to help keep quiet.
- Learn more about choosing and setting up an exhaust fan.
- Example 1: Cheap but loud VIVOSUN 6 Inch 390 CFM exhaust fan. If you plan to use a carbon filter to stop smells, it’s typically cheaper to get a kit that contains both the fan and filter than to buy them separately. Avoid “booster” fans that cost under $35. Although they seem like a good deal, they’re not powerful enough to properly vent heat or use a carbon scrubber. I’ve tried.
- Example 2: Quiet but expensive AC Infinity CLOUDLINE S6 or CLOUDLINE T6 (T6 version is the same fan but has a digital interface)
- Cost: ~$110 ($65-140)
- Carbon Scrubber
- A carbon scrubber and an exhaust fan are used together to clean the air in your grow area. Learn more about controlling odors.
- Note: it’s typically cheaper to get a kit that contains both the exhaust fan and filter than buy them separately.
- Recommended: 6-inch Carbon Filter, 6″ x 16″ version
- Cost: ~$80
- Growing medium: Coco coir or soil (hydroponics for more advanced growers)
- Containers: Smart pots or Air Pots between 2 and 7 gallons (here’s the brand I use)
- Recommended: One bag of this coco potting mix which is enough to fill 5 x 3-gallon smart pots
- Cost: ~$70
- You need a “vegetative” or all-purpose plant nutrient for the first part of your plant’s life
- You need a “bloom” or low-nitrogen nutrient for the budding phase
- Many nutrient systems have a nutrient schedule so you give your plants the right ratios for each stage of life
- Always start at half strength with a new base nutrient system because the recommended strength is typically too high for cannabis
- Get examples of great cannabis nutrients
- Recommended Base Nutrients: General Hydroponics Flora trio (use at half strength) + CaliMagic (use at full strength)
- (Optional) Bloom Supplement: General Hydroponics Floralicious Bloom
- Cost: $50-100
Other Supplementary Items
- Get your seeds – $5-12/seed (on average, can be more or less depending on the breeder)
- 24-Hour Timer (to put your grow lights on a timer so the plants get a day and night period on a schedule). Why do cannabis plants need to be on a day/night schedule? What about autoflowering light schedules? – $10
- Water containers (I personally use a 3-gallon or 5-gallon water jug to mix up nutrients, but anything can work) – Much cheaper at Wal-Mart ($5-15) than online!
- Extra 1/8″ Rope Ratchets (sooooo handy) – These can be used to hang your grow light or carbon filter from inside the tent, and still be able to easily move it up and down without needing any strength. Your grow light usually comes with a set of rope ratchets, but it’s a great idea to get an extra set to hang the carbon filter – $15
- Thermometer/Humidity Monitor with a probe so you can keep track of the temperature inside the tent – $15
- PH Test Kit – Prevent potential nutrient deficiencies by testing the water pH: https://www.growweedeasy.com/ph – $15
- Measuring spoons for measuring out your nutrients (many people already have these) – $10
- Learn about other cool growing tools
Estimated Cost: $744 plus the cost of seeds