The package they came in would have told you. If you no longer have the package, you could try to look up a simular string of lights on e-bay or Amazon. Then see what they are rated at.

I have two sets of christmas lights hanging in my room. One is the icicle light style and the other is just a regular sting of lights and neither of them are LED. I was wondering how much energy they use compared to a regular light bulb in your room?