2 yrs ago, I replaced all of my florescent light fixtures. I went back to the screw in type. Only these bulbs are the newer version of florescent bulbs. So far, so good. I've had to add more fixtures but, I'm still using less bulbs and now getting the same amount of lighting. As Bj pointed out, they are cheaper to run. Cost wise, for me, I usually buy these in bulk to make it cheaper yet.
Just my $0.02 worth.
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