Juwel tanks are the shizzle, they're some of the best tanks on the market, the lighting will be brilliant if you bought your tank after jan 2009 then all equipment should last as long as it should, however, if you bought the tank or equipment prior to jan 2009 then it will probably fail, the reason for this is that Juwel outsourced all equipment manufacture except tanks to china, anything made in china will probably fail, Juwel twigged and sourced manufacture back to germany, and the lighting units made in china have a red sticker on the underside, the ones made in germany have a blue sticker.
The tanks have always been made in Germany, using a very efficient production line, the quality control systems in place are very strict, to ensure quality equipment.