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Secret Jardin Dark Room

Secret Jardin Dark Room grow tents: top-tier for demanding growers

The Dark Room V4.0 is the flagship in Secret Jardin's line-up. Thick 600D polyester outer fabric, 25 mm steel frame with stainless steel corner connectors and hammered Mylar at 95% reflectivity — built for years of intensive use in humid environments with no wear or corrosion. Where the Hydro Shoot and Dark Street compromise for hobbyists, the Dark Room does not.

Two formats available: the Dark Room 150×150×217 cm for 2.25 m² canopy under 600-1000W lighting, and the rectangular Dark Room Wide 120×237×200 cm for 2.84 m² in a long, narrow configuration. Space Booster and waterproof tray included. For experienced Belgian growers — fast delivery.

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Dark Room 150x150x217cm steel Ø25mm extraction ports grow tent | Secret Jardin

Dark Room V4.0 150x150x217

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Dark Room Wide 120x240x200cm large grow tent assembled view | Secret Jardin

Dark Room Wide V4.0 120x237x200

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The Dark Room V4.0: what makes it top-tier?

The Dark Room is the highest line in the Secret Jardin range, designed for growers who refuse to compromise. Compared to the mid-range Dark Street, the Dark Room offers four serious upgrades: 600D polyester fabric instead of 210D (substantially thicker, genuinely buy-it-for-life material), stainless steel corner connectors that will not corrode in humid environments, hammered Mylar at 95% reflectivity for diffused light distribution, and the Space Booster system included as standard in every Dark Room. For serious growers investing 500+ euros in lighting and ventilation, the Dark Room is the sensible platform.

Two formats for large canopies

The Dark Room deliberately targets larger setups — smaller sizes are covered by the Dark Street and Hydro Shoot. The two available models:

Dark Room V4.0 150×150×217 cm — the square 2.25 m² canopy with 217 cm height for serious lighting up to 1000W HPS or dual LED rigs. Ideal for 9-12 plants in 15-litre pots, or larger SCROG installations
Dark Room Wide V4.0 120×237×200 cm — 2.84 m² long footprint for attic rooms, extended garages or alcoves. Perfect for multiple lights in line, or a mother tent next to a flowering tent

The Space Booster system: more volume, sturdier setup

Under normal operation, your extractor fan pulls tent walls inward through the negative pressure it creates. That reduces your effective grow space by 10-20% and creates unstable hanging points. The Space Booster is an internal steel frame that keeps walls taut against the negative pressure. Included as standard in every Dark Room — on other brands this is a separate 30-60 euro accessory. Beyond volume retention, the Space Booster frame also provides extra mounting points for SCROG nets, curtains or intermediate tiers.

Hammered Mylar: why texture matters

Standard smooth Mylar reflects light like a mirror: everything comes back straight from the angle of incidence. Good for total quantity, bad for distribution — you get local "hotspots" where light concentrates on reflection and can scorch leaves. Hammered Mylar has a crinkled structure that scatters light in multiple directions. Result: even light distribution across the canopy, no hotspots, and lower canopy layers receive more light through scattering. Under intensive 600W+ lighting this is a measurable advantage in uniform growth and yield.

Compatible with LED and heavy HPS setups

Reinforced 25 mm steel tubing with stainless steel corner connectors supports 50-75 kg of equipment depending on model — enough for a heavy HPS rig with reflector, carbon filter, extractor and oscillating fan combined. Multiple ventilation ports at different heights enable passive air intake at the bottom and active extraction at the top — the natural convection essential for thermal control under heavy lighting. For a complete turn-key solution, the Deluxe Dark Room 90 with 250W HPS is also available as a complete grow pack.

FAQ - Frequently asked questions about Secret Jardin Dark Room

What justifies the Dark Room price over a Dark Street?

Three things: the 600D fabric (versus 210D) that protects you against years of intensive use, stainless steel corners that will not corrode in the high humidity of an active grow, and the included Space Booster that is a separate 30-60 euro accessory on other tents. For growers running multiple cycles per year, the Dark Room pays for itself in durability; for occasional use, the Dark Street is more than sufficient.

How much weight can the ceiling frame support?

The reinforced stainless frame with 25 mm tubes supports 50 kg on the 150×150, up to 75 kg on the Wide. That is ample for a full HPS rig (reflector + lamp: 12-15 kg) plus carbon filter (8-15 kg) plus extractor (5-8 kg) plus oscillating fan. Always distribute weight across multiple hanging points for stability.

Which extractor fits a Dark Room 150×150?

The 150×150×217 has a volume of 4.9 m³. Under 600W HPS with heat control, aim for 30-40 air changes per hour, so 150-200 m³/h net after carbon filter — pick a 300-400 m³/h extractor. Under LED with lower heat output, 100-150 m³/h net is enough. Use 150 mm ducting for minimal pressure loss.

Does the Dark Room 150×150×217 fit in a standard 250 cm ceiling room?

Yes, but tight. The tent is 217 cm tall, leaving 33 cm clearance — enough for assembly but little margin for ventilation above. Account for floor thickness too: tiles on concrete can reduce effective height by 2-3 cm. For rooms with 240 cm ceilings or less, a Dark Street 120 (200 cm) is a better idea.

Is the waterproof tray really 100% leak-proof?

Yes, the included floor tray is made of vinyl-coated PVC with an 8-10 cm raised rim. It catches full reservoir incidents — handy for hydroponics or recirculating irrigation that might leak. Clean the tray between cycles with mild soap; no harsh chemicals that would attack the coating.

Order your Secret Jardin Dark Room today at Plant & Flower. Fast, discreet delivery anywhere in Belgium.