So with my new Noopsyche lights I had issues with hanging the lights from the plastic bracket, which they call a paw (or claw). I had an issue with the paw cracking in the middle to where my lights were close to falling from my rail. I added a second rail spaced apart so I can mount the lights from the 4 holes in them directly. I'm much happier with the way they are mounted now.
Overall I'm very happy with the lights. I'm considering adding another 1 or 2 to the tank, although probably overkill since I already have 5 and was told that I should only need 3.