Bulbrite helps you see, do, engage and experience every moment as it's meant to be. Bulbrite is here to inspire you to Turn Life On in a way that only the right, beautiful light can do. This is a five pack of 25-watt dimmable bulbs. These T4 bulb are fully dimmable with a bi-pin base. They have a C-2 filament and are UV safe for both indoor and outdoor usage. Compatible with any kind of home dimmer switch or fixture.