I hung some light fixtures this weekend. They are two-light four-foot T-8 fixtures, from Home Depot. In total, I have six lights (well, so far...). Four lights are on circuit A, two are on circuit B. Let's ignore the lights on circuit B.
To have some better control over the lights, I mounted two switches. Switch 1 controls lights A1 and A2, switch 2 controls A3 and A4 (the lights on B circuit also have a switch, but again, let's ignore these - they're fed by an entirely different panel).
Lights A1, A2 and A3 are perfectly quiet. Light A4 hums...but only if all four lights are on. If I switch A1/ A2 off, and only A3 an A4 are on), there is no hum. Any ideas what it could be? I could of course replace the humming fixture, but that may not fix it. :icon_scra :icon_scra
To have some better control over the lights, I mounted two switches. Switch 1 controls lights A1 and A2, switch 2 controls A3 and A4 (the lights on B circuit also have a switch, but again, let's ignore these - they're fed by an entirely different panel).
Lights A1, A2 and A3 are perfectly quiet. Light A4 hums...but only if all four lights are on. If I switch A1/ A2 off, and only A3 an A4 are on), there is no hum. Any ideas what it could be? I could of course replace the humming fixture, but that may not fix it. :icon_scra :icon_scra