... LED bulbs and tubes and the solution for dielectric voltage withstand test. ZWL-TI4-W is a model for ... with ZWL-TI4D in line LEDlamps test system, it is the solution for dielectric voltagewithstand test.Test object: bulbs, PAR lamps, spotlight ... ,tubes, and other power modules, etc.Function:dielectric strength index test.Powerful automatic statistical function: it can calculate the ...