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I wasn't confident that these would work so I bought regular fluorescent tubes just in case. But I like these LED guys even better. Pretty, bright light, slightly pinker cast to the fluorescent's slightly yellow. Installation is the same as the fluorescent tubes. Can't speak to the longevity because it's too soon and the fluorescent tubes last long, too. But these are on all the time, under the kitchen cabinets, so I would like to replace them even less often.
Initially I assumed I'd bought the wrong size because these seemed too big for the fixture. But it was really just a matter of gently prying apart the grips at either end of the light and inserting this bulb. The light is bright and lovely, more like a daylight bulb or task lighting than the jaundice yellow you want in, say, a living room. I am excited to insert the other three bulbs that came in this package into our existing fixtures, but I'll wait till those bulbs burn out.
I'll revise this review in the future to comment on the bulb's longevity.