They do what they say they'll do--but have not lasted

July 1, 2019 Update: Two of the four bulbs I installed have gone out. One went out within 6 months, the other went out about a month ago. I have other bulbs in similar conditions which have lasted many years. I am disappointed in the short life of these. I have adjusted my overall rating down because of this problem. Original Review: These does exactly what I want them to do: they turn off in daylight, and on in darkness. I was skeptical because when I opened the package and looked at the bulbs, I could not find a photo sensor … so I expected these to stay on all the time, contrary to the claim. But, even though I couldn't find the photo sensor, it must be there. These do indeed turn on at night and off in the morning. The only reason I gave these 4 stars instead of 5 is that they were described as "cool white". I'd describe them as "blue-white". (I'll take some of the blame for this, though, because the description did say 6000K, and I didn't pay enough attention to that. I wish I'd gotten the 3000K version.) In the end, these do the job they say they'll do.

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