There are two questions to consider, quality of the light and conservation safety. Florescent lights tend to be cooler (even "warm" florescents) and therefore cast a very different light than older incandescent. So if a warm glow is important you'll have to use a color filter or incandescents. Florescent light does have a higher level of UV which might be a concern depending on what is being lite. This can be mitigatrd by UV filter film.