I cant speak on all LED strip lights, but mine are insanely bright. I made a power box with several features, one being a dimmer that's installed inside the box.
In my opinion, putting in these LED strips is not the best idea I ever tried. Halfway through the strip I installed, it got a severed connection and now only one half of the shack is lit now. I just don't think they ever would stand up to the punishment one levies on their shack when setting up and tearing down. That said, it's still plenty of light.