1200 lumens size F32T8 replacement (48in x 1in tube) (others available upon request) color temperature 3500k 4200k (others available upon request) lifespan 60,000hr life 3yr warranty candle power at work surface is equivalent to a 32watt T8 fluorescent tube MK1 works with standard fixtures and ballasts (no rewiring necessary), and is not for use with direct connection to building AC power. MK2 is for use with direct connection of tube to AC line