i have 2 extra fluorescent tubes not being used. is their a way to find out where on the kelvin scale they are without the package they came in.
just using what it says on the side of the light itself?

one says 40cw/rs/ew..........cw maybe cool white?
and the other
f40kb.eco
sp 30

can any1 help me?
thanks

__________________
pick it, pack it, fire it up.....come along......and take a hit from the bong

cool white usually means it is on the 2700k spectrum, which is better for flowering than vegitative growth, look for the 6500k daylight cfl (or the spiral flouros)
that is the better spectrum for veging

so the cw means coolwhite?
what whould the other be then?

__________________
pick it, pack it, fire it up.....come along......and take a hit from the bong

its a 40w kitchen and bath bulb. "f" just stands for flourescent.