Cooltube Protube Reflector – Air Cooled Hood for Temperature Control

The Cooltube Protube Reflector is the definitive tool for growers who want to maximize light intensity without turning their grow tent into an oven. This tubular reflector is designed to actively remove the heat generated by your HPS or MH bulbs, allowing you to maintain a perfect climate while pushing your plants to their productive limit.

Are you tired of fighting against temperature spikes that ruin your harvest quality?

It is incredibly frustrating when you have everything dialed in, but the heat from your HID lamps makes the temperature fluctuate wildly. One day your plants are happy, and the next they are suffering from heat stress, fox-tailing, or losing those precious terpenes you worked so hard for. This inconsistency forces you to raise the lights higher than you want, sacrificing yield just to keep the plants alive.

That lack of control takes away your confidence. You spend your time worrying about the thermometer instead of enjoying the grow. Every time you move the light up to lower the heat, you know you are losing lumens and potential gram-per-watt efficiency. It feels like a losing battle where you have to choose between light intensity and safe temperatures.

The Cooltube Protube is the solution to achieve stable, repeatable, and professional results. By enclosing the bulb in a glass tube connected to your extraction system, it sucks the heat away at the source. This gives you the power to control the environment precisely, ensuring that your indoor garden stays in the perfect range for explosive growth, regardless of the wattage you are running.

Why this product helps you get more consistent results

The design of the Cooltube Protube is focused entirely on environmental stability. Unlike open reflectors that radiate heat downwards onto the canopy, this cylindrical system creates a sealed tunnel for air to pass through. This means the heat produced by the bulb is physically removed from the room before it can affect your ambient temperature.

This mechanism makes it incredibly easy to repeat the same conditions crop after crop. By removing the variable of "bulb heat" from the equation, your Climate Control becomes much more predictable. You won't have to constantly guess how high to hang the light; you can set it to the optimal distance for photosynthesis and trust that the temperature will remain steady.

Factors that influence the result and how to control them better

• Temperature Management: The Cooltube can lower the temperature at the plant tips by up to 4ºC compared to open reflectors, making it easier to stay in the "sweet spot" of 24-26ºC.
• Light Distance: Because the glass remains cool to the touch, you can bring the light much closer to the plants. This increases the light intensity (PPFD) reaching the buds without the risk of burning them.
• Airflow Efficiency: Its aerodynamic tubular shape allows for smooth airflow, ensuring your extractor fan works efficiently to remove hot air without back pressure.
• Bulb Protection: The high-resistance thermal glass protects your bulb from humidity and splashes, reducing the risk of failure and ensuring consistent light output.
• Space Optimization: Its compact design is perfect for smaller Grow tents where heat buildup is usually a major problem, allowing you to grow in tight spaces with high-power lights.
• Reflectivity: The included stucco aluminum wings ensure that light is directed downwards and outwards, covering your footprint evenly.

Recommended routine to achieve good results every time

1. Prepare: Choose the right size (125mm or 150mm) based on your extractor fan and ducting diameter. Ensure your bulb (400W or 600W) is clean before installing.
2. Install: Hang the Cooltube using pulleys. Connect the aluminum ducting to both ends (or one end if using as a passive intake, though active extraction is recommended) and secure with clamps.
3. Use: Turn on your extraction system before turning on the light. This ensures air is flowing over the bulb immediately.
4. Check: Place your hand at the canopy level. If you don't feel radiant heat, the distance is safe. You can usually get as close as 20-30cm depending on the wattage.
5. Maintain: Wipe the glass tube inside and out between grows. Dust blocks light, and a clean glass ensures maximum lumen penetration.

Advantages and benefits of that consistency

• More Confidence: You will stop stressing about heat waves destroying your crop. You know the Cooltube has your back.
• Denser Buds: By getting the light closer, you utilize the inverse square law of light—more intensity equals harder, heavier flowers.
• Extended Growing Season: You can continue to grow indoors even during warmer months when open reflectors would make it impossible.
• Equipment Longevity: By removing heat efficiently, you reduce the strain on your other Grow lights equipment and cooling systems.
• Plug & Play: It comes pre-wired, so you don't need to be an electrician to set it up. Just plug it into your ballast and go.

Frequently Asked Questions

Does the glass reduce the light intensity?

Any glass barrier reduces light slightly (about 3-5%), but the ability to move the light closer to the plants more than makes up for this loss, resulting in a net gain of usable light energy for the plant.

Can I use LED bulbs with this reflector?

This reflector is designed for HPS (High Pressure Sodium) and MH (Metal Halide) bulbs which generate significant heat. LEDs generally have their own cooling systems and don't fit this form factor.

Do I need a separate fan for the Cooltube?

Ideally, yes. Connecting the Cooltube to a dedicated extraction circuit is the most efficient way to remove heat. However, many growers include it in their main extraction line with great success.

What is the difference between the 125M and 150L models?

The 125M has a 125mm (5 inch) opening and is great for 400W or 600W bulbs in smaller spaces. The 150L has a 150mm (6 inch) opening and is longer, providing better coverage and airflow for larger setups or 600W+ bulbs.

Personal Experience of Pevgrow’s CEO (Alan)

Consistency is the holy grail of growing. In my early days, I struggled a lot with temperature fluctuations, especially when summer arrived. I remember watching my plants stall because the room was hitting 30ºC, and I couldn't do anything about it without turning off the lights. That's when I switched to air-cooled reflectors.

The Cooltube Protube changed the game for me. It allowed me to find that "sweet spot" where the light is intense enough to produce rock-hard buds, but the temperature stays perfectly stable at 24ºC. Being able to reproduce these conditions cycle after cycle is what took my harvests from "okay" to professional grade.

I particularly love the 150L model for 600W setups. It clears the heat so effectively that I can practically touch the glass without burning my hand. If you are struggling with heat or just want to get your lights closer for better yield, this is the upgrade you need.