旨在使没有中号螺丝底座的白炽灯或灯泡能够安装到具有中号螺丝底座插座（能在 110 伏和 130 伏电压范围内运作）的灯具或灯架上的适配器或转换器。
Important: If you supply products for sale on Amazon, you must comply with all federal, state, and local laws and Amazon policies applicable to those products and product listings.
Examples of permitted listings
Lighting products that comply with all applicable federal, state, and local laws and are not otherwise prohibited by Amazon policy.
Examples of prohibited listings
Light bulbs and other lamps that violate applicable energy efficiency standards.
Adapters or converters designed to allow an incandescent lamp or lightbulb that does not have a medium screw base to be installed into a fixture or lampholder with a medium screw base socket that is capable of being operated at a voltage within 110 and 130 volts.