They're very bright. Anyone saying otherwise is a liar. The brightness is seen both day and night with absolute ease. One thing I'd change is a barrier so you don't have time stare directly at the lights. A cap if you will to block seeing the blinding LED light. One small change and they'd be perfect. I wanted mine to be an uplight not down and it can be done but the led is too bright for that asthetic. Overall though they're beautiful and tons of fun ways to color them.
These lights are a great addition to my gaming room and I love them! There's a lot of color and scene options to fit any mood. I want to give them 5 stars but installing them did have some challenges. You can only put the lights counter-clockwise around your room because of the design so the button to turn them on is not where I wanted it to be. Also I didn't realize this at first so I put on half the lights wrong and had to take them off which did remove some of my wall with it. They give you a good bit of replacement sticky pads so it was okay in the end and I still love them! Might get more for other rooms.
I have my downlights paired with my T2 back-lit TV on either side of the room and it really transforms the room. The only concern I have is that the button mechanism that's attached to the cable tends to run a bit warm. For that reason we don't leave it plugged in overnight to ensure safety.