Personally I would not use any type of fluorescent light for them. A lamp with a regular bulb or a natural light bulb would be much better. Fluorescent light is not good for humans let alone piggies. Fluorescent lights can cause headaches, trigger migraines, eye problems, irritable moods etc. The reason why is that the light in those "flickers" (the non scientific term) at a certain rate....its kinda like turning a light on and off very fast so it appears to be on all the time. Not to mention that mercury and such are inside that fluorescent light and you can see the problems that can arise.
Here are a few tidbits of information about Fluorescent lights:
Fluorescent lighting was not meant to come into such general use: it was a temporary, emergency feature that was only ever intended to keep factories working 24 hours a day during the second world war.
Based on the research of Dr Fritz Hollwich and others, cool white fluorescents are legally banned in German hospitals.
Dr Helen Shaw found that the people who had the lowest risk of developing skin cancer were those whose main outdoor activity was sunbathing. Twice the risk of developing melanomas was found in office workers who had to work indoors all day under fluorescent lights. She also demonstrated that office lighting caused mutations in cultures of animal cells.
Although humans cannot see fluorescent lights flicker, the sensory system in some individuals can somehow detect the flicker. Ever since fluorescent lighting was introduced in workplaces, there have been complaints about headaches, eye strain and general eye discomfort. These complaints have been associated with the light flicker from fluorescent lights.