An accumulator with at least two accumulator cells which are arranged in an accumulator housing and which are connected electrically with each other by a connector element. In an exemplary embodiment, a rate chamber and a synchronized chamber are defined. The heat-expandable pressure-sensitive adhesive layer preferably has a shear modulus in an unfoamed state of less than 7\xd7106 Pa. The cleaning tubes are adapted to clean a single deposition pin with a single tube per wash cycle. The modular networked light bulb may have a networked controller conforming with the predetermined form factor used as the electronics module.