These A15 bulbs have a medium/E27 base. [Size Guide]
Used with our Commercial Medium Stringers, they are an 15 watt bulb, are 2" in diameter (3.5" with base), and have an average life of 2,000 hours.
A15 bulbs have a similar shape of a regular light bulb, but are a bit smaller (the size of an appliance bulb). A great choice when a bit more light is needed for backyard or patio.