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I have 36" fluorescent fixtures (Crescent Lighting Model SLP1210LES) that are 7 years old that take 2 bulbs each - a T5 21 Inch and a T5 12 Inch . I decided to replace with LED bulbs and decided on these because they are ballast-compatible. The first fixture died within 2 days of running these LEDs. I was hoping this was a coincidence. I put the 12 inch replacement in a different fixture and it ran just fine for a month. I then decided to put the 21 inch in. As soon as I put it in and flipped the switch, neither replacement LED bulb turned on. I put the original functional fluorescents back in and they didn't work either, meaning the ballast blew. Now I have to deal replacing the entire fixtures!
Easy to install direct replacement for existing 21" fluorescent tubes. Needed to push the receptacle a smidge wider when installing but unlike others fit fine. A bit brighter than the fluorescents and no doubt will last much longer.