About a week ago I fitted two five foot fluorescent lights with opal diffusers in a long kitchen. They were for an old lady in the household who wanted brighter lighting as her sight was going. I have now been asked by her daughter to change them again, perhaps for shorter ones as they are giving her (the daughter) migraine headaches. I don't know if shorter ones will help as it may be the UV content of the light that affects her. I know dimmers don't work with fluorescents but wondered if painting the inside of the diffusers with something would help. There are special tubes for fishtanks but they would probably be much more expensive. I'm a bit out of my depth on this one and any advice would be appreciated.