These lights are very bright and easy to install. Pry up the wide end of the lantern and pull it out. Unscrew the cartridge from the lamp housing and pull out the bulb. Insert the flat plug into the socket. I don't know if they are polarity sensitive or not but I could easily tell the colors of the wires so I matched them. Before I put them in place I taped a few wraps where it connects just to secure it a little more and protect it from the weather. Although it really isn't necessary.
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