... and test. Dc voltage in the box internal is transformed into 12 v output to light sit interface.3.The parameters ... ,E17.E26/27,E40,T8,GU5.3.G24,B22 ,etc, all sockets can be customized. Parameters can be tested (voltage, current, power, power ... .4, Power Factor(PF) parameter:LED power factor can be displayed. (PF is a very important parameter for LED; power factor for traditional lamp ...