HPS & MH Grow Tent Kits -- Complete HID Grow Room Packages
HPS (High Pressure Sodium) and MH (Metal Halide) grow tent kits bundle a grow tent with a complete HID lighting system -- ballast, reflector, and matched bulb -- into a single purchase for a complete, ready-to-operate growing setup. HPS/MH combination kits typically include both bulb types: an MH (Metal Halide) bulb for the blue-spectrum vegetative stage and an HPS (High Pressure Sodium) bulb for the red-spectrum flowering stage, with a digital ballast that switches between the two bulb types. This dual-bulb approach provides spectrum-optimized lighting for each growth stage from a single fixture and ballast investment.
HPS Performance vs. LED
Modern commercial LED grow lights have surpassed HPS in efficiency (umol/J) and are gradually becoming the default in new indoor growing installations. HPS kits remain a compelling choice for: growers who value lower upfront fixture cost (HPS kits are typically less expensive than equivalent-output LED kits); climates where the additional heat from HPS is a benefit rather than a problem (cold growing rooms in winter); and growers who have existing experience and infrastructure for HPS that makes a transition to LED disruptive. HPS produces proven, well-understood results and remains a valid production choice despite its efficiency disadvantage relative to LED. Browse complete HPS and MH grow lights and all grow tents.
Standard Kit Configurations
The most common HPS grow tent kit configuration: 4x4 ft tent with a 600W digital ballast, 600W HPS bulb, 600W MH bulb, and a 6-inch air-cooled or wing reflector. 5x5 ft tents typically use a 1,000W HPS system. Expert support available -- call 888-815-9763. Fast shipping.
HPS Grow Tent Kits FAQ
Is HPS or LED better for a grow tent kit?
LED outperforms HPS in efficiency (umol/J) and produces less heat, making temperature management easier in small tents. For most new growers setting up their first production tent, an LED kit is the better long-term investment despite higher upfront cost -- lower electricity bills and no bulb replacement costs pay back the premium over several grows. HPS kits make more sense when budget is the primary constraint, when the growing space benefits from HPS heat output, or when the grower has specific experience and preferences for HPS production.
What wattage HPS system should I use for a 4x4 tent?
600W HPS is the standard for a 4x4 tent -- it provides the right output for full canopy coverage without the excessive heat of a 1,000W system in a small enclosed space. A 1,000W HPS in a 4x4 tent requires significant additional cooling (air-cooled reflector with dedicated extraction plus room AC) to maintain temperatures below 85 degrees F. 400W HPS under-lights a 4x4 tent -- adequate for vegetative growth but below the intensity needed for peak flowering production.
Do I need both MH and HPS bulbs?
MH provides a blue-spectrum output better suited to compact vegetative growth; HPS provides a red-spectrum output that drives flowering productivity. Running MH during veg and switching to HPS for flower produces better overall results than running HPS throughout -- less vegetative stretching under MH leads to more compact plants that are easier to manage in the flowering stage. Many digital ballasts support both bulb types, making the dual-bulb approach easy to implement by simply swapping the bulb at the photoperiod change.
How much heat does an HPS grow tent kit produce?
A 600W HPS system generates approximately 2,000 BTU/hr of heat -- equivalent to a small space heater running continuously during the light period. In a 4x4 tent in a climate-controlled room at 70-75 degrees F ambient, a 600W HPS with an air-cooled reflector exhausting heat from the reflector directly typically maintains tent temperatures in the 75-82 degree F range -- acceptable but warmer than LED setups. Without an air-cooled reflector, a 600W HPS in an enclosed tent raises temperatures 15-20 degrees F above ambient, requiring active room cooling to maintain acceptable plant temperatures.
Can I upgrade from HPS to LED using my existing tent?
Yes -- the tent is a separate investment from the lighting system. When transitioning from HPS to LED, keep the existing tent and replace only the lighting components (ballast, reflector, bulb) with a quality LED fixture. The tent infrastructure (duct ports, hanging bars, reflective interior) works equally well with LED fixtures. The main adjustment when switching to LED in an existing HPS tent: the lower heat output of LED may require adding a small heater during cold weather if the HPS heat was previously helping maintain target temperatures in a cold room.