It doesn't blink at all to the naked eye but if someone can explain to me how to upload a phone video I'll show you what it appears to do in the camera screen. I've noticed the top of the plant has actually been paying more attention to it than the CFL light & the cfl is closer.Leds should never blink as its a diode not a bulb and does not operate in a manner that would cause this, like hid and old flouros, unless there wa a fault in the driver, you could have been pickin it up from other lights in your spot.. I'm sure you were aware of that though but someone reading this at some point may not of.. Do you guys think those small lights have an real impact on your plants? I'm gonna supplement some of my rooms and was thinkin led but the cost is huge so I was curious if there was a real benefit with the smaller lamps.