Incredibly bright! Blew my mind with how bright they are. I plan on attaching them to a 12v LED driver so I can dim them as I please. They come with 3M adhesive attached to the back, however it seeems like the lights were laid out in a line then a large strip of double sided adhesive was applied to them, as the individulal lights are not cut out seperately, they are all linked together by the big strip of adhesive. Not an issue as they can be cut apart with a knife of sissors. Look to be a high quality product so far