# Choosing your setup: tent, space and budget tiers

> Choose the space first, then size everything to it. A 60 x 60 cm (2 x 2 ft) tent suits one or two plants and a 100–200 W LED; 80 x 80 to 90 x 90 cm (about 3 x 3 ft) suits two or three plants and 200–320 W; 120 x 120 cm (4 x 4 ft) suits two to four plants and 400–650 W. Size the exhaust fan to change the tent's air about once a minute, plus 25–50 % for the carbon filter and ducting.

- Canonical: https://genetixbay.com/knowledge/guides/choosing-your-setup.html
- Category: Start here · Level: Beginner
- Evidence: Grower practice · Status: Draft: awaiting expert review
- Stage: Any stage · Systems: Soil, Coco, DWC
- Updated: 2026-10-31 · Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay Knowledge Base (genetixbay.com/knowledge)"

## Questions and answers

**What size grow tent should a beginner buy?** A beginner should usually buy a 60 x 60 cm (2 x 2 ft) to 90 x 90 cm (3 x 3 ft) tent, about 140–180 cm (4.6–6 ft) tall. It holds one to three plants, needs a modest 100–320 W [LED](https://genetixbay.com/knowledge/glossary/led.md) and a small [exhaust fan](https://genetixbay.com/knowledge/glossary/exhaust-fan.md), and is easy to keep cool and dark. A 120 x 120 cm (4 x 4 ft) tent yields more but costs more to light, cool and run.

**How many plants fit in a grow tent?** A 60 x 60 cm (2 x 2 ft) tent fits one or two plants in 11 L (3 gal) pots; an 80–90 cm (3 x 3 ft) tent fits two or three in 11–19 L (3–5 gal) pots; a 120 x 120 cm (4 x 4 ft) tent fits two to four in 19 L (5 gal) pots, or more small plants. Fewer, well-trained plants fill a canopy as well as many, and stay within legal [plant limits](https://genetixbay.com/knowledge/glossary/plant-count-limit.md).

**How big an exhaust fan do I need for my tent?** Size the exhaust fan to replace the tent's air about once a minute. Multiply length x width x height in feet to get cubic feet, then add 25 % for a [carbon filter](https://genetixbay.com/knowledge/glossary/carbon-filter.md) and 10–20 % for each bend in the ducting. A 4 x 4 x 6.5 ft tent (104 ft³) needs roughly 130–160 [CFM](https://genetixbay.com/knowledge/glossary/cfm.md) of real airflow; a 100 mm (4 in) inline fan with speed control covers 2 x 2 and 3 x 3 tents.

**How many watts of LED do I need per square foot?** For flower, plan on roughly 25–40 W of efficient LED per square foot (about 270–430 W/m²) at 2.5–3.0 [µmol/J](https://genetixbay.com/knowledge/glossary/photon-efficacy.md), which gives an average of about 600–900 [µmol/m²/s](https://genetixbay.com/knowledge/glossary/ppfd.md). That is 100–150 W for a 2 x 2 ft tent, 225–320 W for 3 x 3 ft and 400–650 W for 4 x 4 ft. Judge by the fixture's measured PPFD map, not by its 'equivalent' wattage.

**Can I grow without a tent?** Yes, a closet, cupboard or spare room can work if you can make it light-tight, keep it at 20–28 °C (68–82 °F), exhaust its air and clean it. A tent is easier for a first grow because its reflective walls, sealed zips and duct ports solve light leaks, smell control and airflow in one box, and it protects floors and walls from water.

**How much does a beginner grow setup cost?** A basic 60 x 60 cm (2 x 2 ft) setup with tent, LED, fan and filter, pots, medium and meters typically costs a few hundred dollars; a mid-range 90 x 90 cm (3 x 3 ft) setup with a better light, a logging sensor and a controller-ready fan costs more; a 120 x 120 cm (4 x 4 ft) setup with high-efficacy light and climate control costs the most. Spend first on the light, fan and meters.

**Short answer.** Pick the space first and size everything to it. A **60 x 60 cm (2 x 2 ft)** tent suits one or two plants and a **100–150 W** efficient LED; an **80–90 cm (about 3 x 3 ft)** tent suits two or three plants and **200–320 W**; a **120 x 120 cm (4 x 4 ft)** tent suits two to four plants and **400–650 W**. Size the exhaust fan to change the tent's air about **once a minute**, plus 25–50 % for the carbon filter and ducting. Spend on the light, fan and meters before anything else.

**Legal first.** Plant-count limits decide how many plants you may grow, which decides the tent. Do the [legal check](https://genetixbay.com/knowledge/guides/legal-check-before-you-grow.md) before you buy.

## What do you need to choose a setup?

To choose a setup you need measurements and a short list of generic equipment classes, not a shopping spree. Before buying:

- [ ] A tape measure: floor space, ceiling height, distance to a power outlet and to a window or vent for exhaust
- [ ] The room's normal temperature range in summer and winter (a cheap thermometer for a week)
- [ ] Your legal plant limit and any rules on locks or visibility
- [ ] A budget split: roughly 40–50 % light, 15–20 % fan and filter, 15 % tent, the rest pots, medium, meters and nutrients

The kit itself (every tier):

- [ ] Grow [tent](https://genetixbay.com/knowledge/glossary/tent.md) with light-tight zips and duct ports
- [ ] Dimmable full-spectrum [LED](https://genetixbay.com/knowledge/glossary/led.md) with a published PPFD map ([lights for beginners](https://genetixbay.com/knowledge/guides/lights-for-beginners.md))
- [ ] Inline [exhaust fan](https://genetixbay.com/knowledge/glossary/exhaust-fan.md) with speed control, ducting and a [carbon filter](https://genetixbay.com/knowledge/glossary/carbon-filter.md) ([smell control](https://genetixbay.com/knowledge/guides/smell-control-basics.md))
- [ ] One clip-on or [oscillating fan](https://genetixbay.com/knowledge/glossary/oscillating-fan.md) for canopy air
- [ ] Pots with drainage ([fabric pots](https://genetixbay.com/knowledge/glossary/fabric-pot.md) or plastic), saucers or a tray
- [ ] Medium: potting mix, buffered coco, or a [DWC bucket](https://genetixbay.com/knowledge/glossary/dwc.md) ([choosing a system](https://genetixbay.com/knowledge/systems/choosing-a-system.md))
- [ ] [pH](https://genetixbay.com/knowledge/glossary/ph.md) and [EC](https://genetixbay.com/knowledge/glossary/ec.md) meters, calibration buffers ([pH made simple](https://genetixbay.com/knowledge/guides/ph-made-simple.md))
- [ ] Thermo-hygrometer with min/max memory; a timer
- [ ] RCD/GFCI-protected power ([electrical and water safety](https://genetixbay.com/knowledge/guides/electrical-and-water-safety.md))

## Which tent size is right for a beginner?

The right first tent is usually 60 x 60 cm (2 x 2 ft) to 90 x 90 cm (3 x 3 ft), because a small tent is cheaper to light, easier to cool and forgives one plant's mistakes. Height matters as much as footprint: allow pot height + plant + 30–45 cm (12–18 in) light gap + the fixture and its hangers.

| Tent footprint | Area | Plants ([pot size](https://genetixbay.com/knowledge/glossary/pot-size.md)) | Efficient LED for flower | Exhaust fan (real airflow) |
|---|---|---|---|---|
| 60 x 60 cm (2 x 2 ft) | 0.36 m² (4 ft²) | 1–2 (11 L / 3 gal) | 100–150 W | 100 mm (4 in), 50–100 CFM |
| 80 x 80 to 90 x 90 cm (~3 x 3 ft) | 0.64–0.81 m² (9 ft²) | 2–3 (11–19 L / 3–5 gal) | 225–320 W | 100–125 mm (4–5 in), 100–150 CFM |
| 120 x 60 cm (4 x 2 ft) | 0.72 m² (8 ft²) | 2 (19 L / 5 gal) | 200–300 W | 100–125 mm (4–5 in), 100–150 CFM |
| 120 x 120 cm (4 x 4 ft) | 1.44 m² (16 ft²) | 2–4 (19 L / 5 gal) | 400–650 W | 150 mm (6 in), 150–250 CFM |
| 150 x 150 cm (5 x 5 ft) | 2.25 m² (25 ft²) | 4–6 (19–25 L / 5–7 gal) | 650–1,000 W | 150–200 mm (6–8 in), 250–400 CFM |

LED wattages assume a fixture of about 2.5–3.0 µmol/J, which delivers an average of about 600–900 µmol/m²/s across the footprint in flower [1][2]. Plant counts are *Grower practice*; your legal limit wins.

**Pot size is a trade-off, not a fixed rule.** Bigger pots give bigger plants within reason and hold water longer, which forgives a missed day [5]. Small pots can still produce big plants if you water and feed often (the founder has grown 4 oz+ from a 16 oz cup with [high-frequency fertigation](https://genetixbay.com/knowledge/glossary/high-frequency-fertigation.md)). For a first grow, 11–19 L (3–5 gal) is the forgiving choice.

## How do you choose a setup, step by step?

Choose a setup in this order; each step depends on the one before.

1. **Measure the space.** Note floor area, ceiling height and the nearest outlet. Leave 30 cm (12 in) around the tent to reach zips and ducting.
2. **Pick the footprint** from the table, within your plant limit. When in doubt, go one size smaller for a first grow.
3. **Pick the height.** 140–160 cm (4.6–5.3 ft) for autoflowers and short, trained plants; 180–200 cm (6–6.6 ft) for [photoperiods](https://genetixbay.com/knowledge/glossary/photoperiod.md) that stretch 50–150 % after the flip.
4. **Size the light to the footprint.** Choose a dimmable LED whose published PPFD map shows 600–900 µmol/m²/s average over your footprint at 30–45 cm (12–18 in), with edges no lower than about 60–70 % of the centre.
5. **Size the exhaust fan.** Tent volume in cubic feet (L x W x H) ≈ the CFM for one air change a minute. Add 25 % for the carbon filter and 10–20 % per duct bend, and buy a fan with speed control so you can run it at 50–70 % [3].
6. **Match the carbon filter** to the fan: same duct diameter and a rated airflow at least equal to the fan's.
7. **Add canopy airflow.** One clip fan per 0.4–0.8 m² (4–9 ft²), gently moving leaves, never blasting them.
8. **Check the power budget.** Add up the watts (light + fans + heater or dehumidifier) and keep the circuit under 80 % of its rating (see [electrical safety](https://genetixbay.com/knowledge/guides/electrical-and-water-safety.md)).
9. **Choose the medium.** Soil for the most forgiveness, coco for faster growth and daily attention, DWC for speed with the most risk ([choosing a system](https://genetixbay.com/knowledge/systems/choosing-a-system.md)).
10. **Run the empty tent for 48 h** with light and fans on their timer. Log temperature and [RH](https://genetixbay.com/knowledge/glossary/relative-humidity.md) lights-on and lights-off before any seed goes in.

## What are the budget tiers?

A beginner setup comes in three tiers, defined by equipment class rather than brand. Cost ranges are rough and vary by country.

| Tier | Footprint | Light class | Air | Meters and control | Typical total (rough) |
|---|---|---|---|---|---|
| **Starter** | 60 x 60 cm (2 x 2 ft) | 100–150 W LED board, ~2.3–2.6 µmol/J, dimmable | 100 mm (4 in) inline fan, basic speed dial, matching filter, one clip fan | pH pen, EC pen, min/max thermo-hygrometer, mechanical timer | A few hundred USD/CAD |
| **Solid** | 80–90 cm (~3 x 3 ft) | 225–320 W LED bar or board, ~2.6–2.9 µmol/J, published PPFD map | 100–125 mm (4–5 in) EC (electronically commutated) fan with thermostat/humidistat speed control | Logging temperature/RH sensor, calibrated pH and EC meters, digital timer | Roughly 1.5–2.5x Starter |
| **Serious** | 120 x 120 cm (4 x 4 ft) | 400–650 W multi-bar LED, ~2.8–3.0+ µmol/J, dimmable from a controller | 150 mm (6 in) EC fan with controller, filter, two clip fans, small dehumidifier | Logging sensors (air, [leaf temperature](https://genetixbay.com/knowledge/glossary/leaf-temperature.md), root zone), PAR/quantum meter, controller with alerts | Roughly 3–5x Starter |

Where to spend first: light efficacy and a published PPFD map, then a speed-controlled fan, then meters. Cheap fixtures with inflated "equivalent watts" claims, and fans without speed control, are where beginner money is most often wasted [2].

## How will you know it's working?

You'll know the setup is right when the empty-tent test and the first weeks of growth are boring:

- **Temperature:** lights-on 22–28 °C (72–82 °F) with the fan at 50–70 % speed, not 100 %. If the fan is flat out and the tent is still above 30 °C (86 °F), the light is too big for the space or the room is too hot.
- **RH:** within 5–10 points of the stage target ([climate basics](https://genetixbay.com/knowledge/guides/climate-basics-vpd-cheat-sheet.md)).
- **[Negative pressure](https://genetixbay.com/knowledge/glossary/negative-pressure.md):** the tent walls pull in slightly when zipped ([negative pressure](https://genetixbay.com/knowledge/glossary/negative-pressure.md)), and there's no smell outside the tent in flower.
- **Light:** a PPFD reading at canopy height near the target, edges within about 30 % of the centre.
- **Darkness:** stand inside the zipped tent with the lights off in a lit room for two minutes; you should see no pinpricks of light ([light leaks](https://genetixbay.com/knowledge/environment/photoperiod-light-leaks.md)).
- **Plants:** an even canopy with no plant shaded by its neighbours.

## What mistakes do beginners make when choosing a setup?

Beginners mostly buy too big, too cheap or in the wrong order:

- **Buying the biggest tent that fits.** A 4 x 4 needs four times the light, a bigger fan and more cooling than a 2 x 2. Start small.
- **Buying the light by "equivalent watts".** Only measured PPFD over the footprint and µmol/J efficacy count [2].
- **A fan with no speed control.** It's either too loud and too dry, or too weak.
- **Forgetting the filter's resistance.** A carbon filter and two bends can cut real airflow by a third or more.
- **No room above the plants.** Photoperiods commonly double in height after the flip.
- **Too many plants.** Two well-trained plants fill a 3 x 3 as well as six cramped ones, with better airflow and less mould risk [6].
- **Daisy-chained power strips** and no RCD/GFCI near water ([electrical safety](https://genetixbay.com/knowledge/guides/electrical-and-water-safety.md)).
- **Skipping the 48 h empty test.**

## Evidence

- Yield scaling with light intensity indoors: *Supported* by cannabis trials [1]; light and planting density were among the main yield factors in a meta-analysis [4].
- LED efficacy as the main driver of light cost: *Established* [2].
- Air movement improving canopy gas exchange: *Supported* in non-cannabis research [3]; mould risk in humid, stagnant canopies: *Established* [6].
- Pot size and plant growth: *Established* in a cross-species meta-analysis [5]; the pot-size trade-off against feeding frequency is the house position.
- Tent, plant-count and fan sizing figures: *Grower practice*.

## Sources

1. Rodriguez-Morrison V, Llewellyn D, Zheng Y, 2021. Cannabis yield, potency, and leaf photosynthesis respond differently to increasing light levels in an indoor environment. Frontiers in Plant Science 12:646020. https://doi.org/10.3389/fpls.2021.646020
2. Kusuma P, Pattison PM, Bugbee B, 2020. From physics to fixtures to food: current and potential LED efficacy. Horticulture Research 7:56. https://doi.org/10.1038/s41438-020-0283-7
3. Kitaya Y, Tsuruyama J, Shibuya T, Yoshida M, Kiyota M, 2003. Effects of air current speed on gas exchange in plant leaves and plant canopies. Advances in Space Research 31(1):177–182. https://www.science.gov/topicpages/a/air+current+speed
4. Backer R, Schwinghamer T, Rosenbaum P, et al., 2019. Closing the yield gap for cannabis: a meta-analysis of factors determining cannabis yield. Frontiers in Plant Science 10:495. https://doi.org/10.3389/fpls.2019.00495
5. Poorter H, Bühler J, van Dusschoten D, Climent J, Postma JA. 2012. Pot size matters: a meta-analysis of the effects of rooting volume on plant growth. Functional Plant Biology 39(11):839-850. https://doi.org/10.1071/FP12049
6. Punja ZK, 2021. Emerging diseases of Cannabis sativa and sustainable management. Pest Management Science 77:3857–3870. https://pmc.ncbi.nlm.nih.gov/articles/PMC8451794/