Long Life, Solid State, light emitting diodes make this series of snap-in lamps a very dependable component. : Body Material: Nylon Lens material: Polycarbonate Bezel material: Panel Thickness: 0.030 min Certifications: 2V - CUL, TUV 12 - 14V - UL, TUV 24-28V - TUV. The 12-14 Volt Lamp Assemblies are intended for use in automobiles and trucks with about (standard)13.8 volts(most vehicles). They may of course, be used in other circuits that provide voltage in the tweleve to fourteen volt range. No assitional resistor needs to be used. The 24-28 volt values are generally used in systems such as control panels. If you plane to use the Lamp Assemble with AC, then connect a diode in series with the lamp assembly, No additional resistor needs to to be used. Two volt LED Assemblies may be used with practically any higher voltage, simply calculate the value of resistor to be use in series with the LED. The 2 volt LED assemblies are supplied with information on each card describing how to determine the resistor value of bothe AC and DC with a simple formula or by following a chart.