What does a complete grow box kit contain?

A typical kit includes: a grow tent (lightproof, reflective inside), an LED lamp, an air extractor with activated carbon filter, a circulation fan, a hygrometer/thermometer, a timer, hangers, and cable passages. Soil, pots, and fertilizer are generally not included.

What size grow box to start with?

For beginners, we recommend 60×60 cm or 80×80 cm. These sizes are easy to manage, energy-efficient, and sufficient for 1 to 4 plants. Larger tents require more experience for climate control and watering.

How much does a grow box consume?

A 60er kit with 100 W LED consumes about 30 to 50 kWh/month (€8 to €13 of electricity in France). A 120er kit with 480 W LED about 150 to 220 kWh/month (€38 to €55). LEDs are significantly more economical than old HPS/MH lamps.

Complete grow box kit or separate purchase?

Kits are 15 to 30% cheaper than separate purchases and their components are coordinated. Separate purchase is only interesting if you already have experience and want to upgrade specific components.

What grow box for 3 plants?

For 3 plants, we recommend an 80×80 cm kit. This provides the necessary space for tilting techniques or SOG (Sea of Green). A 60×60 cm tent is too narrow for 3 plants, and a 100×100 cm kit would be wasteful. The Medium 80er kit with 240 W LED is the optimal choice.

How to avoid odors in the grow box?

Odors appear mainly during the flowering phase. Essential: a properly sized activated carbon filter (volume × 40–60 = m³/h). The filter must be replaced regularly (every 6 to 18 months). Low humidity (below 50%) further reduces odors. Seal all cable and ventilation openings with Velcro.

What humidity is optimal in the grow box?

During the growth phase: 50 to 70% (plants grow faster with higher humidity). During the flowering phase: 40 to 50% (keep low to minimize the risk of mold and botrytis). Below 35% is too dry; above 70% in flowering is dangerous. A digital hygrometer with min/max memory is essential.

Can I set up a grow box in a basement?

Yes — basements are often ideal: constant temperatures (16–20 °C), low outside temperatures help with cooling, no daylight leakage. Disadvantages: high natural humidity (hygrometer, even dehumidifier needed) and more difficult cable access. Ensure sufficient air extraction to the outside.

EQUIPMENT GUIDE

Best complete grow box kit

Informative comparison of complete grow box kits: what to pay attention to, which size is suitable, and which kit is ideal for starting — for growing legal plants where permitted.

Kits compared

Key criteria

Levels

Legal notice (France): In France, owning and buying a grow box or grow tent is legal. However, growing cannabis (THC) at home is prohibited by French law. This guide is purely informative and focuses on equipment intended for growing legal plants, herbs, or hemp where the law permits. It does not in any way encourage illegal cultivation.

GROW BOX◆COMPLETE KIT◆LED LIGHTING◆CARBON FILTER◆INDOOR CULTIVATION◆GROW TENT◆EXTRACTION◆GROW BOX◆COMPLETE KIT◆LED LIGHTING◆CARBON FILTER◆INDOOR CULTIVATION◆GROW TENT◆EXTRACTION◆

01 / PURCHASE CRITERIA

What to pay attention to?

The four most important factors for choosing your complete grow box kit.

Size & space

60×60 cm for 1–2 plants, 80×80 cm for 2–4, 120×120 cm for 4–9. Measure the available space beforehand.

Lighting

LED is the standard: energy-efficient, low heat, full spectrum. 100 W for the 60er, 240 W for the 80er, 400 W and more for the 120er rooms.

Ventilation & filter

Activated carbon filter and air extractor are essential against odors. A circulation fan strengthens the stems and prevents mold.

Climate control

LED 75 W

Price

80–150 €

03 / COMPONENTS

What's in the kit?

The four essential components of any complete grow box kit — and what to pay attention to for each element.

Chamber & material

Quality kits use 600D Oxford cloth (thicker than cheap 300D). Inside, 95–99% reflective mylar maximizes light usage. Double zipper closures are essential for comfortable work.

LED & spectrum

Full-spectrum LEDs completely replace old 'blurple' panels. Basic rule: 50 W/m² minimum, 75 W/m² optimal. For 60×60 cm: 100 W · for 80×80 cm: 240 W · for 120×120 cm: 400–480 W. PPFD value matters more than indicated wattage.

Extraction & filter

Sizing formula: chamber volume (m³) × 40–60 = required flow rate in m³/h. For a 60er chamber (≈ 0.58 m³): at least 25 m³/h. Activated carbon filter lifespan: 6–18 months depending on humidity. Replace the flange every 6 months.

Climate & control

Optimal: 22–28 °C during the day, 18–22 °C at night. Humidity: 50–70% during growth, 40–50% during flowering. A digital hygro/thermometer with min/max memory is essential. In case of overheating: move the chamber to a cooler place or increase extraction.

04 / INSTALLATION

First steps: installation guide

In this order, beginners correctly set up their grow box — without the usual mistakes.

Assemble the chamber

Assemble the bars, attach the cloth — 20–30 min. Close all velcros and check for light tightness.

Install the LED

Attach the LED to the hangers. Starting distance from the top of the plants: 50–60 cm (full-spectrum). Neatly route the cables to the outside.

Install the extraction

Attach the activated carbon filter inside the chamber, mount the extractor on it, duct to the outside. Order: filter → extractor → outlet.

Position the circulation

Aim a small fan at stem height (never directly on the leaves). This strengthens the stems and prevents mold.

Climate & timer

Set the timer: 18 h/6 h (growth) or 12/12 (flowering). Place the hygrometer. Run for 24 h without plants and check the climate.

Potting afterwards

Calibrate the pH meter, prepare the pots (11 L for 1–2 plants, 16 L for larger ones) and the substrate. Only pot once the climate is stabilized.

05 / COSTS

Consumption & costs

LED consumption at ⌀ 0.25 €/kWh (FR 2026). Growth = 18 h/day, flowering = 12 h/day, over 30 days each.

Kit	LED	Growth (kWh/month)	Flowering (kWh/month)	Elec./month
Budget 60er	75 W	~41 kWh	~27 kWh	~8–14 €
Starter 60er	100 W	~54 kWh	~36 kWh	~11–18 €
Medium 80er	240 W	~130 kWh	~86 kWh	~26–42 €
Pro 100er	320 W	~173 kWh	~115 kWh	~35–56 €
XL 120er	480 W	~259 kWh	~173 kWh	~52–84 €

All values are indicative. Actual consumption depends on dimmer setting, ambient temperature, and operating time.

FREQUENTLY ASKED QUESTIONS

FAQ: grow box kits

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By Cannabuben RedaktionLast updated: 6 June 2026

Key takeaways

Owning and buying a grow box is legal in France; cannabis (THC) cultivation at home is, however, forbidden — this guide is purely informational.
To start, a 60×60 cm or 80×80 cm box is ideal: easy to manage, energy-efficient, suitable for 1–4 plants (legal, where the law permits).
A complete kit costs 15–30% less than separate purchases and its components are coordinated (tent, LED, extraction, circulation, climate control).
The activated carbon filter with air extractor is essential against odors; full-spectrum LEDs are the standard for lighting.
Expect about €8 to €55/month in electricity costs depending on the kit size (LED 75 W to 480 W, base ⌀ €0.25/kWh in France).