It's compatible and replaceable with any E12 socket bulb, maximum 40-Watt each bulb (Bulb NOT Included). Fully dimmable when use a dimmable bulb and compatible dimmer switch. Perfect to hang this pendant light or ceiling light over your kitchen island or dining table with height adjustable pipes or chains. Easily rotatable for flat and 0° to 90° sloping ceiling. (This product does not include a light bulb.)