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I need to put two holes in the ceiling in order to put a LED bar

I would like to align the holes as much as I can so the bar is as much as possible parallel to the vertical walls.

How can I do it?

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    Most people would use a tape measure for this task. – A. I. Breveleri Jun 27 '20 at 13:53
  • Are you sure both walls are parallel? – Solar Mike Jun 27 '20 at 13:55
  • Hi, I'm not sure the walls are parallels, so using a tape meter could result in errors – Luigi Jun 27 '20 at 14:13
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    I have found that, in the end, it does not really matter if decorative fixtures and such are exactly plumb, level, or parallel. What matters is that they look like they are. – Jimmy Fix-it Jun 27 '20 at 14:43
  • I agree with jimmy if a tape won’t work because the room is not square it may become obvious and your perfectly centered bar looks crooked , I have wasted time on corner to corner measurements when adding recessed lighting you almost always have something in the way a ceiling joist , rat runs (boards that have wiring on them) so the best method is to hang where it looks good and your measurements are in the ballpark. – Ed Beal Jun 27 '20 at 15:00
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It depends on how close the bar will be to a wall vs the center of the room.

  • If it's close to a wall, make it parallel to that wall, no matter how unsquare the room is. It will be very obvious if your bar is not parallel to a wall that's 3 feet (1 meter) or less away, but not so obvious that it's not parallel to the wall that's 15' (5 meters) or more away. Unless, of course the walls are obviously out of parallel at a quick glance, in which case it won't matter where you hang the light bar.

  • If you're hanging it in the middle of the ceiling and your walls are reasonably parallel (maybe the gap between walls is no more than about 1" (25mm) bigger at one end than the other (this is a rough guideline number, not a hard-and-fast rule) then you can simply measure from one wall to make it parallel enough.

  • If your walls are significantly out of parallel (roughly in the more than 1" (25mm) off category), then I'd measure the width of the room at one end of the light bar and divide that by 2 to find the center of that location, then measure the width at the other end and divide by 2 to find the center location for the other end. That way the light will split the difference.

In any case, if you're not sure how it will look (and especially if your walls are in that 3rd category of out-of-parallel), use a piece of painter's tape on the ceiling, lined up on your drilling marks and the same length as the light bar to see what it's going to look like. This way you'll know whether it's going to look "weird" (a very subjective thing answerable only by you) or if it will look "OK" (also subjective).

If it looks to "weird" for any reason, either adjust the tape now (while the tape is easy to remove without damage and before you've made permanent holes in the ceiling) to find a less "weird" location or abandon the light bar and come up with a different lighting solution that will work for your room.

Bear in mind that while most carpenters (there are, sadly, some who just don't care) will strive to make every corner exactly 90° and every wall laser straight, very few come out exactly that way. And, even if they were built that way, time has a way of making those change.

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You say "LED bar" but do not give details as to what that is exactly. If it is light fixture then my answer is:

Many light fixtures can use an Adjustable bracket.

If you do a web search for Adjustable Combination Light Fixture Bracket Bar Cross Bar You will find many sources to purchase them or you can find them in the lighting section of your home improvement store.

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It has two bars, one attaches firmly two the electrical box in the ceiling and the other is connected to the first on at the central pivot point. You connect the light fixture the second one,This allow you adjust the fixture, rotate it, back and forth. There are pre-drilled and threaded holes for machine screws to mount the fixture to the bar.

I do not know what your fixture is but it is likely that this is an option that can be made to work.

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