2 case left! AS IS 50 lamps per light set I am only listing as is due to the fact that I am not going to test each light set. I opened one case of 24 sets and tested them. All 24 sets worked so I have reason to believe the same will not be true of the other cases. They are a few years old and have been in storage. They were samples for my job that I no longer need. Spacing is 36 x 9”, (36” lead, 9” spacing) there is no female plug. One end has a male plug. We use them to light trees. You need an inline extension cord that has multiple outlets. I have attached a photo of an example for reference. Then you start lighting trees, bushes, etc from the inside out. Please see photos.