My wife is the director of a preschool that recently underwent a major renovation. One of her teachers has been complaining of headaches since they moved into the new space. The old space had fluorescent lighting, as does the new space. Is there a difference in the bulbs? I have no doubt she’s right about what’s causing her headaches, but curious as to what they might have changed to cause problems now but not last year?
I don’t know much about fluorescent lighting other than that there are many kinds and makes of the tubes. Have you found one that’s better, or worse, than others.
If your wife and her staff are having light induced headaches and it's not sunlight (I get those too. Darn these Irish eyes), have her consider looking up Scotopic Sensitivity Syndrome and the Irlen Institute. It didn't surface as an issue until fluorescent lights became the norm as a lighting source. I was diagnosed at 22 and I will swear on a stack of Bibles with a Rosary in my hand that it's real. There are those who doubt it, but it's a real thing and what causes it is being ambidextrous. It's true. Both sides of the brain are competing for the same information and it short circuits and slows down the information getting to the message center. It's rather fascinating, actually.
I've found that the fluorescent lights that give off a green or yellow hue are worse for me. Even yellow walls are a problem. What the difference is in your wife's case, I couldn't say, but if the incandescent bulb is really outlawed, I will invest in lamp oil. I'm just not doing it.
Did she move from a room/area with windows and sun exposure to one without? Many older schools have windows for all classrooms. Many newer ones do not. Maybe she is getting nothing but fluorescent now.