Phals need relatively low light, but they need lots of hours of light. So not a lot of intensity, but the more duration the better. When I was just getting started with orchids, I used my spare bedroom as a "greenhouse'. It got good eastern light for around 4-5 hours a day, then the sun shifted and the light was dim and indirect. My Phals mostly didn't rebloom. Then, I got some super-cheap fluorescent shop lights (this was before LEDs) , put them on a timer 12 hours a day, and bingo... I got about 80% reblooming. They weren't particularly bright, but they extended the "day", and that's what the Phals wanted.
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