... times of T8 fluorescent lamp lifetime and 2 times of T5 fluorescent lamp.4.pipe in pipe efficient lightbulb is greens ... efficient lightbulb is very simple,it no need to install ballast and starter,it greatly reduced the cost of luminaire.6 ... the replacement using of all the T8 pipe with the ballast, and the lighting of Factory,school,workshop,store,warehouse,office ...