UL has a couple different classifications for LED tubes. Ballast bypass tubes are not UL listed as a lamp. In order for a product to be listed as a lamp, it has to be a direct replacement for the product that is being removed. Since you cant use these lamps without modifying the fixture, they wont get the UL approval.
The ones that you see that DO have a UL label are not UL listed as lamps. They are UL listed as a retrofit "kit".( Internet websites leave out this detail which, in my book, is shady.) To keep the UL approval, the modification needs to be done by a licensed electrician.
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