The Fluval 3.0 is the best planted aquarium light on the market in regards to functionality to cost ratio. Not only does this perform well, but it's backed by a 3 year warranty that we handle in house. Simply contact us, we'll help you troubleshoot and then send out a replacement if warranted. We know your planted tank relies on this light and want to resolve any issues as fast as possible without having to involve the manufacturer who operates slower than we do. Not sure what light to get? Check out our light guide.