I got this for my 75L tropical tank. I have a custom hood which I constructed myself, and I glue-gunned it into place yesterday. It provides enough light to reveal most of the tank clearly at night, with some shady corners. The light isw quite focused, so I wouldn't recommend using a single one for a tank any larger than mine. The tone of the blue is nice, not intrusive, and it doesn't seem to bother the fish. The cable is very long, which is great as it means you can route it neatly. Strangely a UK to European adaptor was included in the box, it was posted quickly, but postage was overpriced. Even with this it comes in at a very reasonable price. All in all a good item.