I have used these with 8mm wide 3000k white light LEDs (SMD 2835 - 300 for 16ft). It was easy to install and cut, and I had both a rotary tool and a small handsaw that worked well. This diffuser wasn't advertised as pristine, but it did a moderate job of adding a little diffusion. It certainly added a bit of professionalism to the setup. If you are using multiple connectors in a row I would recommend getting an extra extension connector so the rails line up better than randomly.