Cooltube Kit 150 mm – Air-Cooled Lighting System for Temperature Control

The Cooltube Kit 150 mm is the definitive lighting system designed for indoor growers who need high-intensity light but struggle with temperature management in limited spaces. This all-in-one kit combines a tubular glass reflector with active air cooling technology, a high-performance ballast, and a specific bulb, allowing you to maximize light intensity while keeping your grow room climate perfectly balanced.

Is heat ruining your indoor harvest?

Problem: We've all been there. You want big, dense buds, so you buy a powerful HPS lamp. But as soon as you turn it on inside your Grow tents, the temperature spikes to dangerous levels. You're forced to raise the lamp so high to avoid burning the canopy that your plants end up stretching, weak, and producing airy flowers due to lack of light intensity.

Agitation: It’s a frustrating cycle. You spend hours adjusting fans, opening zippers, and stressing over the thermometer, but the heat just won't go away. This constant battle not only wastes your time but stresses your plants, stalling their growth and significantly reducing the quality and weight of your final harvest. You end up with a mediocre result after months of hard work simply because you couldn't control the climate.

Solution: The Cooltube Kit 150 mm changes the rules of the game. By enclosing the bulb in a durable glass tube connected to your Air Extraction System, the heat generated by the lamp is sucked away before it enters the grow space. This means you can lower the light much closer to your plants—increasing lumen absorption exponentially—without the risk of heat stress. It’s the smartest way to get professional yields in small cabinets or during hot summer months.

How this Cooltube kit saves you time and headaches

Managing an indoor garden becomes infinitely easier when you aren't constantly fighting thermodynamics. The Cooltube system integrates directly into your ventilation circuit. As air passes through the tube, it cools the bulb instantly. This simple airflow mechanic can lower the temperature at the plant tips by several degrees compared to open reflectors.

Because the heat is removed at the source, you spend less time tweaking air conditioners or worrying about heat pockets. Your daily routine becomes smoother: check the plants, admire the growth, and close the tent. No more panic attacks when you see the thermometer hitting 30°C.

Furthermore, this kit is versatile. You can choose between magnetic or electronic ballasts and select the specific bulb spectrum you need (Growth, Flowering, or Mixed). It’s a "plug and play" solution for Grow lights that adapts to your specific setup, not the other way around.

Simple steps to set it up without wasting a minute

Installing the Cooltube Kit 150 mm is straightforward, even if you aren't an electrician. Follow these steps to get running fast:

1. Mount the Reflector: Hang the Cooltube using pulleys in the center of your grow space. Ensure the glass is clean.
2. Connect the Ducting: Attach 150mm aluminum ducting to both sides of the Cooltube. One side connects to your carbon filter (optional) and the other to your extractor fan.
3. Install the Bulb: Screw your chosen bulb into the socket inside the tube. Crucial: Use a cloth to hold the bulb; natural oils from your fingers can create hot spots on the glass.
4. Peel the Blue Film: The reflector wings often come with a protective blue plastic film. Remove this completely before turning anything on, or it will melt and ruin the unit.
5. Power Up: Connect the reflector cable to the ballast, and the ballast to the mains. Turn on your extractor first, then the light.

Advantages and benefits in your daily routine

• Temperature Drop: Instantly reduces the heat radiating onto your canopy, keeping plants happy and transpiring efficiently.
• Higher Yields: Allows you to place the light 20-30cm closer to the plants than standard reflectors, drastically increasing light penetration and bud density.
• Space Efficiency: The cylindrical design is compact, making it perfect for cabinets where a large Adjust-A-Wings might not fit.
• Versatility: Compatible with HPS and MH bulbs, allowing you to use the same reflector for the entire crop cycle.
• Less Stress: Reduces the need for powerful air conditioning units, saving you money on electricity bills.

Tips to integrate it into your habits without friction

To get the most out of this kit, ensure your extraction fan is always running when the light is on. A good habit is to connect the fan and light to the same timer (or keep the fan on 24/7 for humidity control). This ensures the bulb never heats up without airflow.

Maintenance is minimal. Just wipe the glass tube inside and out with a glass cleaner once per crop cycle to remove dust or residue that might block light. That’s it—maximum performance with minimum effort.

Frequently Asked Questions

How much extraction power do I need for this kit?

Since the air travels through the tube and ducting, there is some resistance. We recommend using a centrifugal extractor (like a VK or RVK) with at least 300-400 m3/h capacity to ensure efficient cooling, especially if you have long duct runs.

Can I use this kit for both growth and flowering?

Absolutely. The kit allows you to select the bulb type. You can choose a Mixed bulb for the whole cycle, or switch between a Metal Halide (MH) for growth and High Pressure Sodium (HPS) for flowering using the same reflector and ballast.

Does the glass reduce the light output?

The glass used is high-quality and heat-resistant, designed to have minimal impact on lumens. While there is a tiny percentage of light loss compared to an open bulb, the ability to move the light closer to the plants more than makes up for it, resulting in a higher total PAR reaching your canopy.

Personal Experience of Pevgrow’s CEO (Alan)

"I've seen too many growers ruin a great crop because they underestimated the heat in a small tent. The Cooltube 150 mm is my go-to recommendation for anyone growing in a 1m x 1m or 1.2m x 1.2m space, especially in summer. It's not just about cooling; it's about vertical space. Being able to gain those extra 20 centimeters of height because the light can be closer is a lifesaver when your Sativas start stretching."

"One pro tip from my own mistakes: double-check that blue plastic film on the reflector wings. It can be tricky to see, but if you leave it on, the smell of burning plastic will haunt you. Peel it off, hook up a decent extractor, and watch your buds fatten up without heat stress."