how many feet of christmas lights for 7 foot tree

That depends on the size of your tree. If you want to wrap the lights around the whole tree, then you would need approximately 250 feet of lights for a 7 foot tree. If you want to wrap them just around the trunk, then you would need about 100 feet of lights. If you want to wrap the lights around the branches, then you would need about 300 feet of lights.