I have some 13w cfl bulbs and a 20 something bulb that I have had kicking around for awhile. How can you tell what they are rated just by looking at them? They do not mention cool or warm white or their kelvin rating.
Frankly you cant tell anyhting unless you have the packaging or something written on the bulb. If theres any kind if serial number on the bulb look that up.
If it glows kinda orange then it probably 2700-3500
if it glows kinda white then it probably around 5000
if it glows kinda blue then its probably around 6500
thats off the top of my head, anybody please feel free to correct me
