Secret Jardin Dark Room V3 DR120 4' x 4' x 6'8" Hydroponic Grow Tent

The Secret Jardin Dark Room V3 DR120 is a premium 4' x 4' indoor grow tent built for gardeners who want stronger structural support, excellent light control, generous vertical clearance, and a flexible equipment layout for a complete indoor garden.

With assembled dimensions of approximately 4 feet wide by 4 feet deep by 6 feet 8 inches high, the DR120 provides about 16 square feet of usable growing area while giving plants and equipment nearly 7 feet of vertical room.

• Grow Space: Approximately 16 sq. ft.
• Reflectivity: 95% Hammered Mylar
• Frame: Reinforced 19 mm Steel Poles
• Access: 8 Dedicated Equipment Ports

The enclosure uses Secret Jardin 210M fabric with a hammered reflective Mylar interior rated at approximately 95% reflectivity. The textured surface helps scatter reflected light across the growing area rather than concentrating it in isolated areas, supporting more even illumination throughout the canopy.

Compared with lighter Secret Jardin tent frames, the Dark Room V3 uses reinforced 19 mm steel poles. Secret Jardin states that this larger tube diameter increases structural rigidity by approximately 26%, making the DR120 better suited for supporting properly mounted lighting, filtration, ventilation, and other equipment.

Eight dedicated equipment access points provide flexible routing for extraction, intake, electrical cables, and compatible cooling equipment. This allows gardeners to build a clean ventilation and electrical layout without routing equipment through the main doorway.

The Dark Room series is designed around strong light containment. The enclosure uses light resistant fabric, secure seams, and carefully positioned equipment openings to help create a controlled environment for scheduled lighting.

The approximately 6'8" interior height provides useful clearance for taller plants, larger containers, suspended lighting, carbon filters, exhaust fans, and environmental equipment. This additional vertical space can be particularly valuable when maintaining recommended distances between the canopy and lighting fixtures.

The washable interior and exterior surfaces make routine cleaning easier between growing cycles. The removable layout and straightforward frame construction also simplify maintenance and repositioning.

Secret Jardin includes a substantial accessory package with the DR120, including CableIT cable management, PocketIT storage, HookIT lighting supports, StrapIT equipment straps, a Space Booster, and WebIT trellis netting.

The Space Booster helps prevent the enclosure walls from pulling inward when exhaust equipment creates negative pressure. By maintaining the full shape of the tent, it helps preserve usable canopy space and can provide additional support for the included WebIT trellis.

The DR120 can be configured for soil gardens, hydroponic systems, automated irrigation, propagation equipment, and environmentally controlled indoor gardening.

For gardeners seeking a durable 4' x 4' enclosure with stronger 19 mm framing, approximately 95% reflective Mylar, eight dedicated equipment ports, washable construction, and a generous accessory package, the Secret Jardin Dark Room V3 DR120 provides a professional foundation for a complete indoor garden.

4' x 4' Growing Footprint

The DR120 provides approximately 16 square feet of usable floor space. The square layout works well with square LED grow lights, multiple plant containers, trellis systems, hydroponic systems, fabric pots, propagation equipment, automated irrigation, and environmental monitoring equipment.

6'8" Vertical Height

The enclosure measures approximately 6 feet 8 inches tall. The additional vertical space provides room for taller plants, suspended lighting, carbon filters, exhaust fans, ducting, environmental sensors, trellis systems, larger containers, and greater light clearance.

210M Reflective Fabric

The Dark Room V3 uses 210M fabric with a reflective interior surface. This material is designed to provide strong light containment, durable enclosure walls, reliable environmental separation, washable interior and exterior surfaces, and long term resistance to normal indoor gardening use.

95% Reflective Hammered Mylar

The interior uses hammered effect Mylar rated at approximately 95% reflectivity. The textured reflective surface helps redirect light toward the canopy, scatter reflected light more evenly, reduce dim areas, improve side illumination, improve lower canopy exposure, and make more efficient use of installed lighting.

Hammered Reflective Texture

Rather than using a completely smooth reflective surface, Secret Jardin uses a hammered texture. This helps distribute reflected light across multiple angles and can reduce concentrated reflection points. The design supports more even illumination around outer canopy areas, lower foliage, corners, plant gaps, and side growth.

Reinforced 19 mm Steel Poles

The DR120 uses 19 mm steel support poles. Secret Jardin states that these larger tubes provide approximately 26% greater rigidity than lighter frame designs. This helps provide stronger equipment support, reduced frame flex, greater structural stability, better resistance to bending, and more dependable long term performance.

26% Increased Structural Rigidity

The reinforced pole system is one of the primary differences between the Dark Room line and lighter Secret Jardin enclosures. Additional rigidity can be especially valuable when properly supporting grow lights, carbon filters, inline fans, environmental equipment, and hanging accessories. Always follow the manufacturer’s equipment load recommendations.

Eight Dedicated Access Ports

The DR120 provides multiple dedicated access points for ventilation and electrical equipment. The supplied product information identifies access for extraction, intake, electrical cables, and cool tube equipment. This allows the enclosure to support several ventilation and equipment configurations without relying on improvised openings.

Extraction Access

Dedicated extraction ports allow warm air to be removed from the enclosure using compatible exhaust equipment. A properly configured exhaust system can help manage heat, humidity, air exchange, negative pressure, and environmental stability.

Intake Access

Dedicated intake openings provide a route for fresh air entering the growing space. Depending on the equipment configuration, these openings can support passive intake, active intake fans, flexible ducting, and environmental air exchange.

Cable Access

Dedicated electrical cable openings help keep wiring organized. These can be used for lighting cords, fan cables, pumps, timers, controllers, sensors, and environmental monitoring equipment.

Cool Tube Access

Dedicated openings are provided for compatible cooled lighting and ducted equipment configurations. This gives gardeners additional flexibility when designing ventilation around heat producing equipment.

Light Resistant Enclosure

The Dark Room series is designed to create a highly controlled lighting environment. The construction helps reduce unwanted light entering or escaping through fabric walls, seams, access openings, equipment ports, and door closures.

Space Booster Included

The included Space Booster helps prevent the fabric walls from being pulled inward by exhaust induced negative pressure. This helps preserve usable canopy space, maintain the enclosure shape, keep walls away from foliage, improve outer plant clearance, and support the WebIT trellis system.

Negative Pressure Management

Strong exhaust systems naturally create negative pressure inside enclosed growing spaces. Without additional support, this can pull flexible walls inward and reduce usable floor area. The Space Booster helps maintain full canopy width, better plant clearance, more consistent airflow, and greater usable interior volume.

WebIT Trellis Included

The included WebIT trellis provides a structured canopy support system. It can help gardeners spread plant growth evenly, maintain a consistent canopy height, support branches, improve light distribution, organize plant spacing, and maintain access between plants.

HookIT Lighting Support

Secret Jardin HookIT accessories are included for lighting installation. These help simplify fixture hanging, organize lighting hardware, make fixture height adjustments easier, and reduce improvised installation methods.

StrapIT Equipment Straps

StrapIT accessories provide support for compatible hanging equipment. They can help position carbon filters, ventilation equipment, and other compatible accessories. Always confirm safe equipment loads before installation.

CableIT Cable Management

CableIT accessories help organize electrical and equipment wiring inside the enclosure. They can be used for lighting cords, fan cables, sensor wiring, controller cables, trellis lines, and monitoring equipment.

PocketIT Tool Storage

The PocketIT accessory provides convenient interior storage for frequently used tools and equipment. It can hold items such as garden scissors, measuring tools, plant ties, thermometers, pH meters, EC meters, and small accessories.

Fully Washable Construction

Both the interior and exterior surfaces are designed to be washable. This makes it easier to maintain a clean growing environment between cycles. Regular cleaning can help remove dust, water residue, soil, growing media, plant debris, and mineral deposits.

Tool Friendly Maintenance

The straightforward frame and removable accessories make routine maintenance easier. Gardeners can periodically inspect steel poles, frame connectors, reflective walls, ports, WebIT, the Space Booster, and hanging equipment.

Soil Compatible

The DR120 can be configured for traditional soil based container gardening. Possible setups include fabric pots, plastic containers, raised trays, automated watering, and hand watering.

Hydroponic System Compatible

The 4' x 4' footprint can also accommodate compatible hydroponic systems. Possible configurations include deep water culture, drip irrigation, coco systems, recirculating systems, drain to waste systems, and propagation systems. Actual equipment fit should be verified before installation.

CO2 Equipment Compatible

The supplied product information identifies the Dark Room series as compatible with controlled indoor systems that may include supplemental environmental equipment. Any CO2 system should be installed and operated according to the equipment manufacturer’s safety instructions and applicable local requirements.

Recommended for Plants Approximately 50 cm to 150 cm

Secret Jardin describes the Dark Room family as suitable for a range of indoor plant sizes. Actual usable plant height depends on container height, lighting fixture thickness, hanging hardware, canopy clearance, ventilation equipment, and plant training method.

Ideal 4' x 4' Lighting Layout

The square footprint pairs naturally with lighting systems designed for approximately 4' x 4' coverage. When selecting lighting, consider fixture dimensions, coverage area, hanging distance, heat output, plant height, available vertical clearance, and frame load capacity.

Recommended Setup Practices

• Read the Secret Jardin instructions before assembly.
• Assemble the frame on a clean and level surface.
• Confirm every 19 mm steel pole connection is fully seated.
• Make sure frame corners are properly aligned.
• Position the enclosure fabric carefully.
• Install the Space Booster before filling the enclosure.
• Install WebIT at the appropriate canopy height.
• Keep electrical connections elevated above the floor.
• Route cords through dedicated cable access points.
• Keep extraction and intake pathways unobstructed.
• Distribute suspended equipment weight appropriately.
• Support heavy equipment according to manufacturer instructions.
• Maintain safe clearance between lighting fixtures and fabric.
• Follow all electrical and fire safety requirements.

Assembly Overview

A typical setup includes:

• Assemble the lower frame.
• Install the vertical 19 mm steel poles.
• Assemble the upper frame.
• Confirm all frame connections are secure.
• Position the 210M fabric enclosure.
• Align all ventilation and cable ports.
• Install the Space Booster.
• Position WebIT.
• Install lighting using compatible hanging equipment.
• Position ventilation and filtration equipment.
• Organize wiring using CableIT.
• Install PocketIT.
• Inspect the enclosure for visible light gaps.

Lighting Setup

When installing lighting:

• Choose a fixture intended for approximately 4' x 4' coverage.
• Verify the actual fixture dimensions.
• Use approved hanging hardware.
• Maintain the manufacturer’s recommended canopy distance.
• Allow room for mature plant height.
• Keep electrical components dry.
• Recheck hanging height throughout plant development.

Ventilation Planning

A properly configured ventilation system helps control temperature, humidity, and air exchange. When planning ventilation:

• Position exhaust equipment near the upper part of the enclosure when practical.
• Position intake lower in the enclosure.
• Keep duct runs reasonably short.
• Minimize unnecessary bends.
• Match fan capacity to the enclosure and equipment heat load.
• Use the Space Booster if negative pressure contracts the walls.
• Keep equipment ports securely closed around installed ducting.

Air Circulation

Internal circulation fans can help distribute air throughout the 4' x 4' canopy. Good air movement helps reduce stagnant areas, balance temperature, reduce localized humidity, move air beneath foliage, and improve environmental consistency.

Cable Management

Use the dedicated cable ports and CableIT accessories to organize wiring. Good cable management helps keep access paths clear, reduce clutter, keep cords away from water, simplify equipment identification, and reduce interference with doors and ventilation.

Plant Arrangement

The 4' x 4' interior can support one large central canopy, four larger plant containers, multiple smaller containers, trellis managed plants, hydroponic systems, and propagation trays. Maintain sufficient room for watering, air movement, inspection, equipment access, and electrical safety.

Trellis Installation

When installing WebIT: position the net at the desired canopy height, use the Space Booster for additional support where appropriate, spread growth evenly, avoid excessive tension on the frame, maintain access around the canopy, and leave adequate room for air circulation below the net.

Cleaning & Maintenance

Routine Interior Cleaning

• Disconnect electrical equipment.
• Remove plants and loose equipment when practical.
• Sweep or vacuum loose debris.
• Wipe reflective surfaces with a soft cloth.
• Use mild soap when necessary.
• Avoid abrasive cleaners.
• Allow the enclosure to dry completely before reconnecting equipment.

Reflective Mylar Care

To preserve the hammered reflective surface:

• Use soft cleaning cloths.
• Remove dust regularly.
• Clean spills promptly.
• Avoid stiff brushes.
• Avoid abrasive pads.
• Avoid harsh solvents.
• Do not drag sharp equipment against the fabric.

Exterior Cleaning

The exterior is also washable. For routine cleaning:

• Disconnect electrical equipment.
• Wipe the surface with a damp cloth.
• Use mild soap when needed.
• Avoid saturating electrical equipment.
• Allow the enclosure to dry completely.

Zipper and Seam Care

• Keep zipper tracks clean.
• Open and close doors smoothly.
• Avoid forcing jammed zippers.
• Keep fabric away from the zipper path.
• Inspect seams periodically.
• Address damage before it becomes larger.

Frame Inspection

• Inspect the 19 mm steel poles regularly.
• Confirm all joints remain secure.
• Check for bending or unusual movement.
• Verify that suspended equipment remains properly mounted.
• Remove equipment before repairing structural components.
• Replace damaged parts before continued use.

Port Maintenance

• Keep ventilation ports clean.
• Inspect fabric around each opening.
• Support heavy ducting independently where necessary.
• Keep cable openings dry.
• Close unused openings securely.
• Check connections whenever equipment is repositioned.

Space Booster Maintenance

• Confirm the Space Booster remains correctly positioned.
• Check attachment points.
• Keep it clear of sharp equipment.
• Make sure it is not placing unnecessary stress on the enclosure.
• Adjust WebIT tension when required.

Storage

• Remove lighting and ventilation equipment.
• Clean and completely dry the enclosure.
• Remove WebIT and accessories.
• Disassemble the steel frame carefully.
• Keep poles and connectors together.
• Avoid sharply folding the reflective fabric.
• Protect the Mylar from punctures.
• Store in a dry indoor location.
• Use the supplied carrying case for transport and storage.

What's Included

• Secret Jardin Dark Room V3 DR120 Grow Tent
• 210M Reflective Tent Fabric
• 95% Reflective Hammered Mylar Interior
• 19 mm Steel Frame Poles
• Reinforced Frame Connectors
• Space Booster
• WebIT Trellis Netting
• HookIT Lighting Supports
• StrapIT Equipment Straps
• CableIT Cable Management Accessories
• PocketIT Adjustable Tool Pouch
• Ventilation Access Ports
• Cable Access Ports
• Cool Tube Access Ports
• Carrying Case
• Assembly Components