I escaped Wisconsin, and I've also lived in St Louis. I agree your plants look great as they are. Don't feel like you need to change anything at all for your current orchids.
There is a member here blooming Vandas, much higher-light orchids than Phals, with natural light in Scotland, which is even farther north than you.
If anything, your light problem would be very short winter days. Even shade-loving plants like Phals get more daylength in habitat than they get as far north as Michigan.
If you do feel the desire to see what happens with supplemental lighting, consider putting some on a timer, and run them just long enough to give your plants enough extra light time to reach 10 hours per day. Some people add light before sunrise plus after sunset. Others just extend daylength on one end.
Home Depot sells a 4 foot double-tube LED shop light. I have read plant people in other forums saying they work well. That is a simple way to do things. If you use more than one fixture, get a power strip and plug the shop lights into that. Plug the power strip into a heavy-duty appliance timer, and plug the timer into a heavy-duty extension cord.
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