lumens.
Another complaint of dollar store CFLs is that most are bluish
"daylight" in color, including some in packages saying "SUN Lighting" and
some in packages that say "Soft warm white light". A majority of the few
of my dollar store CFLs that actually had a "warm" color had a color more
purplish than other "warm" CFLs and also had a low color rendering index.


Usually those "daylight" ones cost significantly more, I like them for
outdoor lighting, they really make plants glow.