I first saw these style of lights when I went to visit my parents and they asked me to install then on the top of fence posts at the entrance of their driveway. It took about 5 mins to install the two using exterior deck screws and they have been working great since. Well, I decided I would buy some of my own but my driveway entryway is concrete and the anchors that came with the lights are 8mm and would need a 14mm bit to drill a good sized hole to install them, plus I didn't have a 14mm bit lying around. I instead went to the store and got some 1/4" tapcons and some 1/4" anchor bolts instead. I first tried the anchor bolts as I figured they would give a nicer look, but didn't realize until after I had the bolts in the concrete that the nuts would not fit. I then resorted to tapcons, but was not too successful on the first hole because I didn't clean the concrete dust out of the hole well enough and didn't run the bit up and down the hole enough times to insure the tapcon would go in well and it snapped off when using the impact. I had to cut off the tapcon level with the concrete and try again, but this time made sure the dust was cleaned out and had run the bit up and down about 10 or so times. After that I got the Tapcons to go in fine and the lights are secure. What I thought would take 15 mins or so actually took about an hour, but hopefully my trial and error will help you out. Also, there are no installation instructions other than making sure you turn on the light and test them before you install them.
Billy 
