The RF capability is intended ONLY to pass IR signals to the extender, which in turn forwards the IR signal to your gear. In other words it's a method to "extend" an IR signal. It is NOT generally able to control RF devices directly.

Having said that, there are SOME exceptions. European X-10 devices can be directly controlled under some circumstances. Even if the frequencies were compatible, the 6000 won't learn an RF signal. It is unlikely you'll be able to get your lights to work. You could use IR controlled lighting (Lutron) or use an X-10 system (would probably require an X-10 controller).

EDIT: We posted at the same time. In any event, I've no doubt the 6000 would be able to learn the IR for your lighting.