In lamp housing is beside the connection for the power supply (terminal block with three connections) is also a transformer to generate the low voltage for the LEDs. These two units plus a huge clutter the lamp housing is not only full, no even overfull. Thus, the lamp can not screw on a flat ceiling. Especially not when you actually also want to charge because of the necessary cables is definitely no place in the housing. The ground wire from the lamp was not properly secured in the terminal block and has become loose. Thus threatening at worst (if you actually tried all your wires on the ceiling squeezing) that that metal case (!) Incl. The metal bars (!) The flower stalk is under power. What a welcome addition to any nursery. I have only done by cutting out a piece of our soft Paradex blanket reasonably to bungle the lamp on the ceiling. In a concrete slab that is likely to be very difficult. The LEDs are the way cool white and in the middle of the lamp is still an ugly lamp socket for an ordinary light bulb which is then freely in space ... a visual disaster. On the specified product this figure is well hidden behind the middle rosanen flowering, but can be guessed yet.