Energy class A Philips MASTER TL5 High Output with G5 lamp base is 40% thinner. Lamp shape is T5 (also called T16 = 16mm)
Lifespan. These thin (16mm) fluorescent tubes have a failure rate of only 10% at 19,000 hours (50% at 24,000 hours). They have a very high efficiency (89 Lumen/watt) and can only be used in combination with an electronic high-frequency ballast.
Application . The Philips MASTER TL5 High Output is ideal for recessed and surface-mounted luminaires in offices, shops, schools, public buildings and industry, where high-quality energy-efficient lighting is required and has a fairly constant light output during its entire lifespan. Dimmable/adjustable on the right ballast.
Available in the lamp colors 827 (warm white), 830 (white), 840 (clear white) and 865 (daylight). The color rendering (Ra)>80. The TL5 High Output is available in 24W, 39W, 49W, 54W and 80W.
Note : The wattages Philips TL5 14W, 21W, 28W, 39W, 49W and 80W can be found in the TL5 HE group. 
