What is a t12?

T12 is a type of fluorescent tube that is 1.5 inches (38mm) in diameter. It is one of the older and less energy-efficient models of fluorescent lighting, as it uses magnetic ballasts and consumes more electricity than newer, more efficient models like T8 or T5 tubes. T12 lamps are commonly found in older buildings and fixtures, but are being phased out in favor of more energy-efficient options due to regulations aimed at reducing energy consumption and greenhouse gas emissions.