(K) refers to the temperature range of the bulb.
(Lumen) refers to the output of the bulb. Did the bulbs not have packages? they should be listed on the package.

C02 is for sealed rooms, dont use it.

Edit::
Ok, the 42w cfls i found online were from 2,700 - 2,800 Lumens each.
---6 x 2,800 = 16,800L