Review on Siedinlar 2-In-1 Solar Fence Lights - Warm & Cool White Outdoor Lighting For Posts, Deck, And Patio Décor - Fits 4X4, 5X5, And 6X6, In Black (4 Pack) by Mariqn Carey

I've had the lights for only a week but so far so good. They last well into the night. Can't say how long as I went to be around 1:30am. They look nice but I wish they were a bit brighter. I'm using the yellow setting vs. the white so maybe they are a bit dimmer.However, there is a trick to installing on a 4x4 post. Don't use the base that is marked 4x4! Use the smallest base that is already installed on the bottom of the lights. Simply remove the inner lining like my photo shows and there you have it. Fits nicely onto a 4x4 post!