These A19 bulbs have a medium/E27 base. [Size Guide]
Used with our Commercial Medium Stringers, they are a 25 watt bulb, are 2.25" in diameter and 3" high (4.25" with base), and have an average life of 2,000 hours.
A19 bulbs are the same size as a regular household bulb and the highest wattage bulb we carry. When you need a significant amount of light, these are a great choice for lighting up larger outdoor areas.