Review on CINOTON 210W LED Linear High Bay Light, 4FT LED Shop Light Fixture 32000LM[800W HID/HPS Equiv.] 100-277V 1-10V Dimmable 5000K Daylight Indoor Commercial Warehouse Factory Office Workshop Garage 2 Pack by Joshua Flake

I installed these in my pole barn and could not be happier. They are designed to be 15 feet from the floor. I hung them under the rafters at 12 feet high and 15 feet apart, they were a little bright so I put them up in the rafters at 15 feet high and they were perfect. If your mounting them lower than 15 feet you may want a dimmer and should space them a little closer together for overlap. Keep in mind if you have a 30 foot wide room DON’T space them evenly dimensionally every 10 feet. That will give insufficient light around the walls and will be very bright in the middle. Put one 7.5’ from wall then 15’ between lights leaving 7.5’ to opposite wall. That way each light illuminates 15’ with some overlap in the middle and some light cast on the walls. I bought long grounded 16awg cordsets for mine and installed in light with metal electrical strain relief and put an outlet by each light. That way you can move them around some if you don’t like the spacing and I’m also planning to insulate so will need to take them down at some point and that will be easy with the cord. I used 10 for a 90’ by 30’ building and there is just shy of enough coverage on the far wall. For a 100’ X 30’ building I would have used 12. I work on cars in my building. Lighting is very subjective. I bought 4 and hung them and moved them around some to decide how many more to order. I think the color temperature is perfect for a shop.I bought the 223 Watt, 5,000 K, 2’x4’ and hung them by the chains that come with them.