The GE LAMPS F40/30BX/SPX35 PK 10 Plug-In CFL Bulb is a white, 40W fluorescent tube designed for both indoor and outdoor use. With a long lifespan of up to 20,000 hours, this T8 bulb offers energy-efficient lighting technology and emits a high output of 2000 lm or more. Made of glass and measuring 48 inches in length, this GE bulb is reliable and suitable for various lighting needs.