Last winter I purchases four 48" double fixtures and installed them
in my mini barn. I removed the line cords and switches that came with
them and hard wired them in parallel on their own 15 amp circuit. From
day one they were noisy with a pronounced flicker to them. They seem
to alternate from one to the other with almost a strobe effect.
Sometimes they work perfectly and at other times the compressor or
portable heater tends to set them off. Other times they start acting
up on their own.
I am seriously tempted to install my old fixtures.