I have seen some fluval ecobright upgrade led lights they are single strip so one strip would replace one tube was wondering if any one has used them and if one strip would be bright enough the guy at the store say one would be enough. My tank is a 250 lt 4 ft tank so the 13 w would be for my tank . I wil have low light plants like java fern . just want some opinions as don't want to buy 2 if I don't realy need to as they are priced at £80.