I have motion sensor lights at the corner of my detached garage, about 100 feet from my shack and about thee same distance from various other antennas. There are 3 high power LED bulbs in the fixture and they don't appear to cause any RF interference...at least not that I've stumbled on yet. I have LOTS of other RF interference producers, most of which there's nothing I can do about, so if the LEDS are producing interference in the same area(s) as some of the others, I'm unaware of it.
I've gone through every RF interference elimination technique I thought possible, many of which helped. I'm just in a dense RF area. I've removed nearly all my wall warts, choosing instead to use a large linear supply and two smaller RF quiet switching supplies (the kind where the noise can be moved if it does interfere, which I've had to do a few times). I also ended up selling a TV very soon after I bought it, but not soon enough to just return it :-(, because it was a huge noise generator in many parts of the spectrum. I would bet that if I took that TV to the FCC for emissions testing, they'd revoke the approval. I'm not sure if it's the FCC or some other agency, but you get the point.
Other thing that have helped a lot are what another poster already mentioned: ferrite beads. You can never have enough ferrite beads. I probably have several dozen of them attached to numerous devices, all of which had some positive impact. BTW, that's about the best, easiest, least costly thing you can do to help with interference.
Another thing you might be able to try, if you have enough coax available going to your Ubiquiti NanoStation M2, is creating a 1:1 balun with the coax. If there's signal coming back down the coax shield from the device, a 1:1 choke balun will get rid of it. That's something that costs you nothing, other than time. I'm not sure how many turns will be needed at 2.4GHz, nor the coil diameter. You'll have to do some research on the internet to find out, but I'd guess the information is readily available. If you do have interference from RF on the coax shield, you could also just buy a 1:1 choke balun instead of building your own. Not free, but certainly less time consuming. If you know someone who has one available that you could borrow, you could test it to see if it helps.
73 - David, AG4F