GreenLighting Solar Post Lights - 4 Pack Black Aluminum LED Post Cap Lights for 4x4 Wood & 6x6 PVC Fences - Waterproof Outdoor Solar Deck & Fence Lighting - Perfect for Patio, Garden, Pathway & Backyard Decoration

We purchased these lights in March of 2020. They don't put off a lot of light, but they are good for creating ambience. We installed 8 on our large deck and they put off enough light that you can see where you are going. It is the begining summer of 2022 and only halve of the lights working. Looks like moisture got into the boards and corroded the boards. There is also a film that has formed on the small solar panel that is limiting the charge on some of the others.This product arrived on time, and was very easy to install. Looks great and appears to be durable. I have had them on my deck for about 2 months now. Only one minor problems. The top does not lock in place. I have 2 at the top of the stairs and if someone takes hold of the top piece it will twist off. No problem with the others as they are not in as of a high traffic area. Since the batteries are under the top you can't really glue in place. Still, I am happy with my purchase even though I wish the top fastened with a screw. The only time one will need to remove the top is to replace the battery. This issue is the reason for the four stars instead of five.1st whoever reviewed... saying the tops pop off easy was incorrect, they do twist off though... I almost did not buy them because of that review.My tops slide into some slots so they do not fall off but i could see if someone were to turn them they could come off. So far we absolutely love them.They measure 6 1/8" sq ID at base. They are not very bright because they only have 1LED but the light they put off is very elegant and look great. The light is more for a mood not for lighting up an area.they do attract gnats though. (day light bright will which they are)Initially, I recommended these; not any more!First, I loved the lights. The look and quality is outstanding, and while they've only been up a few days, they seem to charge pretty well even though they're in the shade a good part of the day - lots of trees! A little pricey, but so much nicer than the cheap plastic solar lights, these are metal & actual glass.Now the downside: We just had our deck rebuilt, and the builder used 6x6 treated posts all around. Unfortunately, the manufacturer of these lights chose to size the adapter (which is plastic) for 6x6 PVC rather than wood, although wood posts are probably used far more often. Don't know why they did, but as a result the adapters, at a true 6", are about a half inch too big for nominal 6x6 wood posts.A bit of 1/4 inch sticky foam weatherstrip under the rim, careful aligning, and judicious tightening of the 2 screws worked out just fine though, and they really add the finishing touch to the new deck, and they really set off the stairs.I used 10 lights for the corner posts, which we cut taller, and used Atlanta caps for the shorter inline posts, and we were initially very happy with the results, then lights began to fail.Update: I have a total of 12 of these lights. After about 7 months of use, most of the lights are still working. Some batteries are already becoming noticeably weaker (i.e., shorter run time even accounting for less daylight hours or cloudy conditions) and three of these have failed completely, apparently due to the seals failing and rainwater getting inside of the unit. There is corrosion on the underside of the lid, around the LED plate, the tiny wires shorted out on the back, and the lights are shot. Not good at about $24 per light, barely over a half year lifespan!Very easy to install, metal construction is nice, the work great - seem a bit pricey for a solar light because most of the panels don't last long, but this is the first season with them, so we'll so how it goes.This product is a perfect fit for the 4x4 post on my privacy fence. The LED lights create a pleasing effect illuminating from the fixtures glass. I would have rated 5 star but the top of the unit could have a tighter fit.3/10/2020 Updated review. Two lights quit working within a two year period. I swapped out the batteries and placed them in a working light and the batteries are OK. Not sure what the problem is and I'm sure the units are out of warranty. I will make an attempt to contact the manufacturer for assistance. At the purchased price point I was expecting to get better performance and longevity. I will update my findings when I hear back from the manufacturer.These look nice and provide a nice white glow on our deck. However the internal wiring is very fragile. I have had to re-solder several of these as the tiny wires just fall off the connections. I would suggest opening each light and hot-glue over EVERY connection so you don't experience this issue.Love that they are glass and beautiful, But..the batteries don’t last and I replaced them but still won’t work. Would not recommend