... factor, power consumption per year.LED Portable sample Case,Portble LED Light Case,led bulb suitcase we could do the case according to your design.1. Could ... compare the power consumption of the LED lamp with traditional lamp on the case. 2,. Could choose E27,B22,GU10,MR16,G9 ... meter is cheaper,it just could show:power,curent,voltage. LED trolley demo case