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Cooltube 125mm Grow Light




The original Cooltube is an air-tight, fully sealed clear glass tube with a lamp mounting bracket in its centre. It’s perfect for removing the excess heat generated by HID grow lights without leaking unpleasant odours.

Air is usually pulled (but can be pushed) over the lamp by adding an extractor fan to one side of the tube, the hot vented air is then expelled away from the growroom and plants. They’re very effective, somewhere in the region of 70-80% of heat is removed, but due to the shape of the reflector the spread of light they give off is not the best. The Goldstar is also fully sealed and gives a much better spread of light, but is quite a bit more expensive.

Reflector dimensions (approx):

Length:  40cm
Width:   12.5cm

The Cooltube 125mm Grow Light Kits are avilable with three different types of ballasts, please make your selection from the dropdown above. You can also click the links below for more info on each ballast

Ipac Pro (magnetic) – Maxibright Ipac’s come with an impressive 25-year guarantee – they are quite literally ballasts for life. Available in 250W, and 400W with the 125mm Cooltube kit.
Warranty: 25 years.

Varidrive: Dimmable to 250W, 400W (and boostable to 660W with other lamp/reflector combinations), the Varidrive is a good digital ballast at a great price.
Warranty: 1 year. (this is the new version of the the Digidrive ballast).

Maxibright Digilight: (currently unavailable) If you prefer a digital ballast that is not dimmable (i.e. less things to wrong) then the Digilight is a good option, the 250W version is especially good value for money.   Available in 250W, and 400W with the 125mm Cooltube kit.
Warranty: 2 years.

Cooltube 125mm Grow Light FAQ’s:

What fans do I need to use with these lights?

That mostly depends on the wattage of each light, but here are some rough guidelines:-

1-2 x 250W/400W lights use a Can RK125 Low Powered Fan

3-4 x 250W/400W lights use a Can RK125 High Powered Fan

These are guidelines only, there are many variables including the length of your ducting and the amount of bends in it (the longer this is, the less overall air gets moved), the type and age of carbon filter if used and the intake airflow. If you’re still not sure what you will need, give us a call and we’ll talk you through it on the phone.

What’s the best ducting to use with Cooltubes?

Combi ducting is recommended, you can use acoustic but it’s a bit fiddly to set up, prone to air leaks and difficult to move up and down as the plants grow (very good in every other situations though).

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