Kicking myself...
Decided today was the day to tackle my kitchen light swap project. Ran to the hardware store and picked up a 3" ceiling electrical box. Current light is 2' long, new one is 8', and the old light isn't centered so needed a new mounting point, one stud over. Got up in the attic, marked and cut a hole for the new box. Wasn't going to rewire the box, as the wiring in the LED panel was long enough to reach the existing one. New box was just to take the weight of the new light, and the panel is wide enough to cover up the previous opening.
Shut off the breaker, and went to put the new light up on the ceiling. It has keyed slots in the center to slip over screw heads at an angle, then rotate the housing a few degrees to lock into place. Had some trouble, the cut outs to fit over the provided screw heads weren't big enough. So had to take it down, get out the dremel and enlarge them a touch. Thankful this thing is pretty light, or this would burn out my arms and shoulders quick! Got it up on the ceiling, then it was time to take the old one down, and swap the electrical connections.
Pair of thumb nuts on the base, 2 screws in the bracket, and it was out. Got the new connections in place, and decided to do a test before closing everything up. Glad I did, cuz the light didn't work (properly) It lit up with a dim flickering glow, like fluorescent light tubes when they're just about dead. Glanced over at my motion sensing light switch, and the indicator lights were blinking in some sort of error code. Then I realized my mistake, my switch has dimming capabilities, and the LED panel is non dimmable.
Even after doing a factory reset on the switch, so it powered the light 100%, it still didn't work. I put that switch in a couple years ago, and completely forgot about the dimming aspect. I figured since it doesn't have the 10v dimming connections, and neither did the LED panel, it would just be full brightness. Nope! So took down the new light, and put the old one back.
Will be heading to the UPS store momentarily to return the light. I'm irritated by this, cuz it was a perfect fit. Covered all the way over to the sink, and still reached the stove and cabinets by the door where the old light was. Will have to get a cover plate for the 2nd ceiling box. Checked out the compatible 10V dimming motion sensing switch, and that runs about $80. Not sure I want to deal with running additional wiring through the wall and attic though. Will have to research some more options. Maybe find a longer light fixture that uses bulbs instead of drivers and panels. Decisions, decisions.