My title says it all. It takes a measurable number of seconds to reach full brightness. And then it doesn't seem bright enough. I don't believe their 1000 lumen rating. My other 800 lumen 3000K lamp is brighter than this one. And no, I don't have such dimmers. First I ordered 2 sets (6 lamps). I had to order another set of those crappy bulbs to fit. I didn't contact them because I had an event I needed to do and I couldn't wait. Bad experience, lost money for 3 sets (9 bulbs) and now I have a stick with all the flaws. The only good thing is that the color temperature is the same as expected. Avoid
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