craft hovering and moving above the trees

30 foot craft moving slowly about 15 feet above the trees almost drifting -- this craft made no sound I could not even hear air moving around the craft. Very very quiet no sound no motor. The lights were beautiful colors- yellow, white and red and surrounded the craft in a straight line. Moved west to east and then turned to the north. The lights seemed to flash lighter and then darker. They did not blink. The part that struck me is how low the craft was and how many lights were on the craft. I hear helicopters all the time around my neighborhood -- there is a hospital close by so they are loud and move fast. This moved slowly and was very low in the sky.