BR30 bulbs are better for outdoor lighting applications because they provide focused lighting to areas. BR30 bulbs tend to have a wider beam angle compared to the A19. This makes them suitable for floodlighting and accent lighting in outdoor settings. A19s typically use omnidirectional illumination, which is not suited for focused or direct lighting applications.
BR30 refers to the type of family the bulb belongs to, the shape, and the diameter of the bulb. BR30 belongs to the reflector family and has a bulged reflector shape. The diameter of the bulb is 30/8 or 3.75 inches.