Bests & Worsts Reviews from Amazon

I've had this gizmo in place for about one month and I thought I'd provide a report for those who want some details on performance. 1. This unit does NOT have a light sensor; that is, it still turns on/off even in the daylight. The product description is silent on this point, my bad for not noticing. 2. The light stays on for about four minutes after activating; NOT adjustable. 3. Despite these quibbles, I am pleased with the key factor: does it reliably sense movement at a reasonable distance? YES. I needed to light a 3-car garage with a nine-foot ceiling. There is already a duplex outlet in the ceiling; to test this unit I bought a simple adapter Leviton Mfg L10-00061-00I Ivory Outlet Adapter Bakelite Slimpak and plugged the whole thing in, hoping the weight of this unit plus a bulb wouldn't simply fall out of the outlet. So far so good (although I will admit to a safety string in case it comes loose). So performance: the light works reliably at a distance of 15 feet..... the situation is such that I can't test to see if it works any further away than that. Interestingly, it does not ALWAYS detect my German Shepherd, but it triggers on humans of every size who are vertical. The nine-foot ceiling may be the problem here. One other piece of info you won't find in the description.... the detection pattern is not completely circular .... it's shaped kind of like a figure-8 with a fat middle. This unit is marked with two arrows, 180 degrees apart, indicating the direction of the longest range. My experience is that this unit triggers at 15-foot distance, regardless of which way it's aimed. So now I'm going to install a permanent socket and get rid of that string. Hope this information helps you. UPDATE: OK I've determined that the unit DOES reliably detect the German Shepherd, but the range is about 10 feet. Installing the permanent socket moved the light about 18 inches... so that may be what fixed the problem. I'm also reasonably certain the range would be greater with an 8' ceiling.