Litetronics International

Login

You are here Education

Lighting Knowledge

Light Bulb Bases Guide Part 3: 3-Way Bases

Screw bases for 3-way light bulbs have three contact wires soldered on the light bulb base. The wire soldered to the side of the light bulb remains the same as the standard screw base light bulb. However, whereas the standard screw base has one contact wire connected to the bottom of the base, the 3-way light bulb base has two contact wires soldered to the bottom of the light bulb in two different locations.

Light Bulb Bases Guide Part 4: Lock-Out Bases

Lock-out screw bases are used in CFL and CCFL light bulbs. Utility companies will provide rebates and incentives to companies for retrofitting their properties with energy-saving compact fluorescents. However, the utility company wants to ensure that once the rebate is given, incandescent light bulbs cannot be placed inside the socket at a later time.