4W T5 Fluorescent 4100K Miniature Bi-Pin - F4T5/CW
"This F4T5/CW is a fluorescent lamp that uses 4 watts. It has a T5 lamp shape, and a G5 base. It has a 4200K color temperature, and a color rendering index of 60. The bulb has 117 initial lumens, and an average rated life of 6000 hours."
Manufacturer part number: F4T5/CW