Philips UniversalFit LED Tubes. The Easiest Replacement for Linear Bulbs. Philips UniversalFit LED Tubes (16T8/LED/48-840/UF18/G) replace T8 and T12 linear fluorescent bulbs and can be used with most electronic or magnetic ballasts. Tubes provide bright, energy efficient light in kitchens, laundry rooms, garages and more with up to 40% energy savings (compared to F32T8 electronic instant start systems). These bulbs turn on instantly, contain no mercury, operate in cold temperatures, and have a long life span. LED lifetime means the length of time (in hours) until half of the LED light sources maintain at least 70% of their initial lumen output (B50, L70). Easily replaces T8 or T12 linear fluorescent bulbs with no rewiring; Compatible with electronic or magnetic ballasts; Turns on instantly and delivers bright, clear light; Bright, even light for rooms with frequent on/off switching; 36,000 hour lifespan.