I had some 4-foot 4-bulb fluorescent light fixtures installed in my garage which has a 1/2" drywall ceiling from the 1960s and holds a double garage door. The fixtures weigh ~25 lbs each and the bulbs add <2 lbs total. The contractor installed them using two 3/8" toggle bolts, one on each end of the light. The bolts are rated for 35 lbs each.
In hindsight, I should've had them screw the lights into the joists, but how likely is it that a light will fall down if I leave them with the toggles? In theory, I have a <30 lb fixture with 70 lbs of support, which seems like a reasonable safety margin. If the lights fall, they would hit the cars, which could shatter a windshield or dent a hood.
In hindsight, I should've had them screw the lights into the joists, but how likely is it that a light will fall down if I leave them with the toggles? In theory, I have a <30 lb fixture with 70 lbs of support, which seems like a reasonable safety margin. If the lights fall, they would hit the cars, which could shatter a windshield or dent a hood.