3 Pack, Mansa Lighting, Mogul/Goliath (E39/E40) to Standard Base Adapters, Use This Adapter to Plug an E39/E40 Bulb Into a Standard E26 Light Fixture, Maximum Wattage Is 150W This adapter works with bulbs operating at 120-240 volts in fixtures not requiring a ballast. This adapter is recommended for adapting LED bulbs that use much smaller wattages than traditional E39/E40 based bulbs as seen in the listing photo. Bulbs with E39/E40 bases are often used in street lights and commercial lighting fixtures. THIS ADAPTER DOES NOT WORK WITH 3-WAY BULBS. THIS ADAPTER ALSO DOES WORK WITH BULBS OR FIXTURES THAT REQUIRE A BALLAST TO START. The maximum wattage for this adapter is 150W.