Yes, definately don't trust the markings - they're mostly correct, but I had 30+ 1.5m strips of 2801 strip lighting from Ray that had CLK and DAT labelled around the wrong way..GoofyGuy said:do yourself a HUGE favor test 1 pixel on your controller before hooking a long strand. Dont make a long string and hope the wiring is correct. A test on 1 pixel can save you 170! The marking are often ok but that means they have a chance of being wrong. Why cook a string of pixels when it takes 1 minute to hook up 1 to make sure.