Quick delivery, even it is Christmas. They are LED 36W, 4' battens, there are lightweight, & stylish, I wanted to replace some 4' florescence battens containing 2 x 36W tubes. The room has four battens, I replace two first to compare. The difference is stunning, the LED battens are a cool white, almost daylight white. The light output of the LED must be double of the old florescence tubes, (remember, these are 72W battens, maybe they fade as they age.) Only snag for me was fitting them. The clips to secure the battens to the ceiling were bit fiddley, maybe because hands are like sausages! Cheers Steve