20W Circline 4100K Cool White 4-Pin
"This FC6T9/CW is a fluorescent lamp that uses 20 watts. It has a T9 lamp shape, and a G10Q base. It has a 4100K color temperature, and a color rendering index of 62. The bulb has 800 initial lumens, and an average rated life of 12000 hours."
Manufacturer part number: FC6T9/CW