how many c9 lights for christmas tree

For a typical medium-sized Christmas tree, you'll need around 500 lights. However, the exact number of lights required will depend on the size and shape of your tree, as well as your personal preferences. If you have a particularly large tree, you may need up to 1,000 lights or more. For a smaller tree, you could use fewer than 500 lights, but it's always better to have more than not enough.