Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Does this have a photo cell to turn it off during the day? Thanks to all of you for the great answers!
Document: This tripled the distance my IR camera can see at night. It has an electric eye to turn it off during the day. I like it, it works well and didn't cost much.
On my unit, the red wire is positive and the white wire is negative. If you need to trace it out, getting at the circuit board is fairly easy. Just untwist the the glass top and then remove two retaining screws located on the outsides on the LED circuit board.This unit comes with a photo diode (located in the center of the LEDs) which will prevent the unit from turning on if there is too much normal day light.
This small compact little bugger gets the job done, this little unassuming little guy has a tough aluminium shell with a good quality cord out the back, the bonus is that the photo cell seems to do a good job of keeping this thing off until its needed...The GoodCompact / well builtSeems to give a good balance of flood and spot for a typical yard / drive way.
These are great; they turned my dark driveway in day. I love these so much, that I have purchased 10 of these altogether. If you buy these you will not be disappointed.P.S. They are very inexpensive.
This IR light works great! Turns night into day on the camera. Has a good spread but stays concentrated for a long way. Plug and play with the splitter from my camera system, so very easy to use. Will be getting more of them for sure!
Oh boy what a difference and how easy to put up this one is not the wide range one you have to read the full description it is great for going next to the house with a fence there have your app on your cell phone have it dark out and move it around your gonna be surprised what a difference they make just simply awesome I defently would recommend
Mine seems to work fine for the first day or so, but then died. Now when it's on, only one LED in the entire array is illuminating. It was cheap but is not a value.
It does turn on and put out infrared light. But the built-in IR illuminators on $20-30 cameras (640x480) seem to be much brighter and more effective. However due to glare issues it is convenient to have another source for the IR and these won the price contest.
The IR light is of no use to me at all as it does not come with any power supply and I do not know what voltage it operates on or what current it needs ?Even cheap cctv cameras come with a power adapterOne day if I manage to find a supply to connect it to I can see if it actually works or not
I am using these lights to illuminate the area around a game feeder and camera and to the night vision and game camera it looks like broad daylight...they are built real nice use minimal power and have a built in photo sensor...the down side- one of the units I ordered leaked in the rain and filled with water (that unit will be getting returned) but even full of water it still worked!! I am going to order 4 more and will probably silicone those to avoid leaking
Answer: Yes they do , and they work  well. The slightest difference in light value triggers it.