how do you know k's for a light?

so I went to the store looking for two 6500k CFL and two 2700k CFL and couldnt tell which were 6500 and 2700. How do you tell what the k's are? Is there another term used for K's or a system or something?

k's is kelvins warm fluoros have low color temp 2700 cool fluoros have a high color temp 4000-6500

most of the cfls ya get at like wallmart dont list color temp just look for warm or cool

ok thank for the advice! appreiate it!

At home depot the blues look like this>

Reds look like this>