F40T12 Fluorescent Light Bulbs
F40T12 fluorescent light bulbs are a four foot fluorescent lamp that is used in a wide variety of applications. The T12 diameter is 1.5 inches and often operates on magnetic ballasts, but sometimes on electronic for better energy efficiency. It's most popular colors are cool white, warm white and daylight just to name a few. Although some people have changed them to T8, there are still many in service and will continue to be a popular 4 foot lamp going forward.