GE Lighting 90285 80W T5 StarCoat high-output fluorescent lamp with 16mm outer diameter (5/8″). These lamps feature StarCoat technology that delivers high quality triphosphor performance. The extremely high surface illuminance of the T5 StarCoat range makes these lamps ideal for indirect luminaires. It is the best suited to uplighting systems or direct lighting in high ceiling applications, such as those in canopies or industrial situations.