Yes, fluorescent lights a well known to be a major source of flare-ups. Lupus patients are very sensitive to UV rays, that is why it is so important to wear sunscreen when outside in the sun. But what most people don't realize is, they should be wearing UV protection inside as well, this means that when working in an office, you should wear UV protection to protect you from the "hidden" UV rays in Fluorescent lighting. This also means that when you go shopping in grocery stores or department stores, you should wear UV protection.
I, as a matter of my daily routine, wear UV protection 24/7. I make sure that I always have a minimum SPF of 35. Sunscreen is my body lotion! It can, sometimes, present a problem when wearing it under makeup, so for your face, you should purchase a non-greasy sunscreen. They sometimes cost a bit more, but it is worth it. Also, many high-end make-ups contain sunscreen. I do both.
Do you have your own office where you work? If so, you can purchase several desk lamps and use those in your office and turn off the fluorescent lights. If you do not have your own office, you could mention, to your office, that most fluorescent lighting can be covered with a protective Plexiglas panel that allows light through but not the radiation that triggers the flare-ups and the pain. Perhaps they would at least be willing to do this in your work area.
I hope that you are able to get over this flare quickly and, hopefully, if you take precautions, you can avoid (or at least minimize) another flare-up. I wish you the very best
Peace and Blessings
Look For The Good and Praise It!