I'd like to add undercabinet lighting to an existing 15-amp circuit powering the lights in my kitchen. We plan to install two 2-bulb xenons and two 3-bulb xenons undercabinet lights controlled by one switch. Does this count as 1 or 4 lights toward the limit?

The circuit currently powers 2 kitchen fixtures, 1 breakfast nook fixture, 2 attic bulb fixtures and 2 garage bulb fixtures. I run compact fluorescents so the load is low and they're seldom powered all at once, but I'm just not sure if the undercabinet is too much for the circuit. Thanks.