Glo is Hagen's aquarium lighting range — fluorescent tubes in four spectra, plus the reflectors, clips and remote ballast gear that go with them. The tubes are the reason most people come here: a T8 fluorescent loses a large share of its useful output long before it stops lighting, so replacing a tired tube is usually the cheapest way to make a tank look better and to get plants growing again.
Choosing a spectrum — the four tubes are not interchangeable, and this is the decision that matters most:
- Aqua-Glo — freshwater. Weighted to lift fish colour while still growing plants. Leaves a slightly warm cast.
- Power-Glo — high output, blue-shifted. Penetrates deeper water, suits planted and reef tanks.
- Life-Glo — full spectrum, balanced natural white. The neutral choice for a display tank.
- Marine-Glo — deep blue actinic. A supplementary tube for marine tanks, run alongside a white one.
Then match the fitting, not the tank. A T8 fitting is wired for a single wattage, and a tube of the wrong wattage will not run properly even if it physically fits. Read what is printed on the tube you are taking out. T8 is 25mm in diameter with a G13 bi-pin cap; T5 is 16mm and needs different gear.
Also in the range: reflector shields, which return the upward half of a tube's output to the tank, and the Glomat remote ballast for twin-tube setups.
