Is Fluorescent Lighting harmful to humans? And, alternately, can they be Healthy for humans?

Is Fluorescent Lighting harmful to humans? And, alternately, can they be Healthy for humans?
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In some cases overexposure to florescent lights coincides with underexposure the sun. We need some sunshine for vitamin D and general well being. As far being beneficial, I have heard of using bulbs that mimic the suns rays to decrease depression. I now someone that tried this, but I am not sure how well it worked.
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