New InstantFit LED T8 from Philips Slashes Conversion Cost and time to replace Fluorescent Tubes with LED technology. LED tubes save over 40 percent in lighting related energy costs- combined with their long lifetime, facility managers can recover their investment in just one to three years.Installers will replace fluorescent tubes within seconds. Philips' InstantFit LED T8 is compatible with most fluorescent fixtures using electronic instant start ballasts, without re-wiring.