I've got a 45 cm Arcadia luminaire over my 45 x 30 x 30, (2 x T8 tubes), which has been great - its about 5-7 years old now, never had any problems with it, very unobtrusive plain aluminium finish. Arcadia are quite expensive, but this is as good as new after years of constant service, so I'm very happy with it.
Mark
PS you can see from my avatar that cats love it!