If you have chosen nothing but "Easy" plants, 10-20 lumen (0.25 to 0.5 watts) per litre is adequate. That all depends upon which plants you have chosen for your aquarium. (20 lumens corresponding to 0.5 watt T5 tube per litre, 40 lumens corresponding approximately to 1 watt T5/litre.) To make it simple, we explain here how many lumens we recommend per litre of water in an aquarium for a selection of plants from the Easy, Medium or Advanced category. The value is written on the packaging for all light bulbs, fluorescent tube lamps, LEDs, etc. Lumens refer precisely to how much light a particular light source gives off, rather than how much energy it produces. It is advisable instead to find the number on the packaging which tells you how many lumens the light source produces. However, this makes it very difficult to compare different kinds of light sources, because light bulbs, fluorescent tube lamps and LED lighting are not directly comparable on this point. Previously, a light bulb or fluorescent tube lamp was classified by how much electricity it used (Wattage). The lumen, level of brightness, is always written on the packaging. Here, we show you how you can put the information from the packaging on the fluorescent tube or bulb to practical use in the aquarium. Choose the correct light source for your needs
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