Smaller than the bulbs I replaced but very bright. I have a dimmer and full light is probably too bright for most applications. And it does seem to wobble a bit when you first turn it on, but I've had no issues with them turning on or staying on at any brightness level. I don't care about the size of the bulb, it seems too small for a lamp, but I'm probably the only one who notices. Again - very bright (five bulbs of 40 watts each). And they're LED, so expect them to last a long time.
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