you could tell us what and how many lampholders you want,then we could do accordingly,has ce and rosh certification E27,E14,GU1010,MR16 base,2 wire clip,600mm T8 tube,could do accordingly.It has three-layer,upper cover is 4tubes,middle layer is for the bulb testing bases,and the lower cover is for bulblamps storage,Using new cool power meter,could show:Power, current, voltage, power factor, power ...