Indoor Grow Kit 400W Without Tent – Complete HPS Set for High Yields

The Indoor Grow Kit 400W Without Tent is the ultimate solution for growers who want to transform a spare room or adapted space into a high-performance garden capable of producing up to 400 grams per harvest. This comprehensive set provides you with the heavy artillery of cultivation—including a powerful HPS lighting system, complete ventilation, organic nutrients, and precision tools—eliminating the need for a pre-fabricated structure and allowing you to maximize your available space.

There is nothing more frustrating than putting months of effort into a crop only to end up with a harvest that varies wildly in quality and quantity from one session to the next. You might nail it once, but then the next time, despite doing "the same thing," the buds are airy, the plants are stressed, and you can't pinpoint if it was the light distance, the airflow, or the nutrients.

This inconsistency kills your confidence and turns growing into a guessing game rather than a rewarding hobby. You waste time and money trying to patch problems on the fly, stressing over yellowing leaves or heat pockets, and feeling like you are gambling with your genetics rather than cultivating them.

The Indoor Grow Kit 400W Without Tent acts as a stabilizing force for your garden, providing a perfectly matched ecosystem where the lighting, ventilation, and nutrition are calibrated to work together. By standardizing your equipment with proven components, you remove the variables that cause failure, ensuring that you can achieve stable, repeatable, and heavy yields cycle after cycle.

Why this product helps you get more consistent results

The core of this kit is the 400W HPS lighting system, a technology that has been the gold standard for decades because of its ability to penetrate deep into the canopy and produce dense, heavy flowers. Unlike mixing and matching random bulbs, this kit pairs the ballast, reflector, and bulb to deliver a specific light spectrum and intensity that cannabis plants love. This means you aren't guessing if your plants are getting enough energy; you know they are.

Furthermore, the inclusion of a dual-extractor system (intraction and extraction) ensures that the heat generated by the HPS light is managed effectively. By balancing the air exchange with the included ventilation tubes, you create a stable climate where temperature and humidity don't fluctuate wildly. This environmental stability is the secret sauce to getting those rock-hard buds every single time.

Factors that influence the result and how to control them better

• Light Intensity: The 400W HPS bulb with a textured reflector maximizes lumen distribution, ensuring every inch of your 1m² canopy receives the energy needed for photosynthesis.
• Nutritional Balance: The Biobizz Try-Pack covers the entire life cycle (Grow, Bloom, and Top Max), eliminating the risk of nutrient lockout caused by mixing incompatible brands of cannabis fertilizers.
• Environmental Control: With the VDL thermohygrometer, you can monitor real-time data, while the 125mm extractor removes heat and the 100mm intractor brings in fresh CO2.
• pH Levels: The included GHE pH test kit and pH Down powder allow you to keep your water in the sweet spot (5.5–6.5), ensuring your plants actually absorb the food you give them.
• Photoperiod Precision: The mechanical timer automates your light cycles, preventing the stress and hermaphroditism that can occur if you forget to flip the switch manually.

Recommended routine to achieve good results every time

1. Prepare the Space: Install the pulleys to hang your reflector and set up the airflow using the aluminum tubing to direct hot air out of the room.
2. Germinate and Plant: Start your 5 PEV Seeds (included) and plant them in your medium, setting the light timer to 18 hours on / 6 hours off for the vegetative phase.
3. Feed and Monitor: Follow the Biobizz chart using the Bio Grow, and check your humidity controller daily to ensure temps stay between 22-26°C.
4. Flip to Flower: When plants are ready, switch the timer to 12/12, change to Bio Bloom and Top Max, and use the pH kit to ensure water acidity is correct.
5. Check and Adjust: Use the pulleys to raise the light as plants stretch, keeping it at a safe distance to avoid burns while maintaining intensity.

Advantages and benefits of that consistency

• Predictable Yields: You can realistically aim for that 400g mark every harvest because the power input is constant.
• Faster Learning: When your equipment is reliable, any issues are easier to diagnose, helping you become a master grower faster.
• Cost Efficiency: You stop wasting money on dead plants or ineffective additives; everything in the box is essential and functional.
• Total Control: You feel like the captain of the ship, managing the environment rather than reacting to disasters.

Frequently Asked Questions

What space do I need for this kit?

This 400W kit is optimized to cover a cultivation area of approximately 1m² (100x100cm). You can set it up in a spare room, a large closet, or a section of a garage, provided you can vent the air out.

Does the kit include a carbon filter?

The kit includes extractors and ducting for air exchange. If odor control is a major concern for your location, we recommend adding a carbon filter to the extraction line, which connects easily to the included flexible tube.

Is HPS lighting better than LED?

HPS is legendary for producing dense, heavy buds and is very cost-effective upfront. While LEDs run cooler, this HPS kit offers an unbeatable price-to-performance ratio for growers who want maximum weight on a budget.

Personal Experience of Pevgrow’s CEO (Alan)

I have a soft spot for 400W HPS setups because it's exactly how I really learned to understand the plant. There is something about the intensity of High-Pressure Sodium that pushes plants to their limit in flowering, creating those rock-hard, sticky colas that we all chase. In my tests, consistency is king—if you can't repeat a success, it was just luck.

With a kit like this, I've found the "sweet spot" is simply keeping the temperature in check. Since the light delivers the power, your only job is to manage the airflow with the extractors. Once I dialed that in, I was pulling consistent harvests like clockwork, without needing to reinvent the wheel every three months. It’s reliable, it’s powerful, and it just works.