Specifications: F54T5/841/CW fluorescent replacement bulbs. Wattage: 54 Watts, CCT: 4100K cool white, Brightness: 4200lm, CRI 80+, G5 bi-pin base, Length: 4FT/46 inch Easy Installation: F54T5 Replacement bulbs come with 2 pins at each end so that you can just pop it into the socket and twist it into place. Easy to install and immediately lights up your home Lifespan: The lifetime of the F54T5/CW fluorescent bulbs is 20000 hours. Long life reduces the frequency of changing the bulbs Wide Application: T5 fluorescent bulbs feature a 4200 lumens high output. Ideal for greenhouses, propagation, office lighting Wide Application: T5 fluorescent bulbs feature a 4200 lumens high output. Ideal for greenhouses, propagation, office lighting F54T5/841/HO Fluorescent Tube Light Bulb, 46 Inch, 54W, 4100K Cool White, 4200 Lumens, High Output, G5 Bi-Pin Base, 4FT T5 Grow Light Bulbs - 10 Pack