I fee your pain, I live in central FL and have 3 horses, 2 of them paints, that are allergic to midges. Where I am, the bugs are most active at dusk and dawn, but are sometimes active during daylight hours too. They do not appear to be active at night. My vet said to turn out at night and stall during the day.
I keep mine stalled w/fans daytime and turn out after dark with bellyband fly sheets/neck covers and fly spray. Then bring them in the next morning. They are doing better now then they ever have! The sheets made all the difference. I use Swat where the sheets don't cover that are a problem - face, groin, some belly area.
I've never noticed that Swat causes issues with sunlight, the pink version would probably be better since it would act as a sunblock. The clear may magnify the sun's rays. But I really don't know for sure.