High-Lite® refers to the new light technology by Juwel® Aquarium, an improved lighting version on the old style T8 standard bulbs It combines the existing tube lengths of the T8 with the new bright T5 technology. The Juwel High-Lite Day ensures optimum luminosity in your aquarium. The special light spectrum of the High-Lite Day fluorescent lamp makes the most of the natural colours of your animal and plant world. • Brilliant colour effects • Colour temperature of 9000 Kelvin ensures bright and invigorating light • Promotes plant growth • Ideal for use in conjunction with Juwel High-Lite Nature or Colour Suitable For Juwel Rio 240 Juwel Rio 300 Juwel Vision 260 Warehouse Aquatics Recommends Over time \"cathode decay\" causes less energy to be transferred through the mercury vapor in your tube. The main effect is that the tube will emit less and less light as it gets older. It happens slowly so it\'s difficult to notice unless you put a brand new tube alongside an older tube, but the light output will slowly dim until it suddenly stops dead one day and this can take years. You might think manufacturers recommend replacing their tubes every 6 months to keep you buying but there is a lot of truth in this. A tube emitting less light although not entirely noticeable to the naked eye is extremely noticeable to your plants to the point where after 6 months you may find the only thing you can grow well is algae! So for the sake of your plants the WA Team recommends replacing your tubes every 6 months or at least every year, a little tip of writing the installation date on your tube with permanent magic marker will help you keep on top of this. For the sake of your wallet we recommend replacing your end caps when you replace your tubes. The caps prevent water getting into your light unit, if this happens it will be the end of the road for your light unit and this type of water damage isn\'t covered under warranty. The caps have a rubber gasket which prevents water ingress but over time this rubber degrades and becomes brittle when exposed to the lighting emitted from your bulbs. It means that the end caps loose the ability to prevent any condensation getting into your unit. Please see the related products tab above this description for all the accessories related to this tube.