I hung them with twine. The ceiling is 11'4". The bracket also has a hole for a screw (included with kit). I also used a dab of shoe goo for insurance. There is a 6" pigtail that plugs into LED. There is no glass in these, only aluminum and plastic plus the many LEDs
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I tried to take pictures of the brightness of the floor compared to ceiling but the camera made them both the same. The ceiling is much dimmer than the floor.
Here is a pic of the LED and what it replaced. The old fixtures were from a filling station and used 6 VHO bulbs at 120 watts each.
That's 720 watts for the fixture. The single 8' LED (same thing only different) that replaced it is less than 50 watts and brighter.
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You can see the difference in brightness above and below.
I have 9) 8' LED tubes for my 24 x 30 shop and it is nice and bright.
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Thanks
Aaron