Bulbs are not included. Socket G9, max. 40 W. Compatible with bulbs of the energy classes A++ - E. Originally with 4 x halogen 40° 40 W, 2000 h, CRI 100, EEC D (as at Feb. 2014). The halogen bulb is available separately. Also works with LED light source. With four built-in LEDs, each 1,2 W, in blue and white. The LEDs are not exchangeable by the user.