usually each led ring has its own module or what you are calling a "ballast". Some led rings only have two wire leads and don't even have a little module box. These modules are usually stabilizing current or reducing the voltage to make it usable for the LED rings.
Ballast are a different item. THey usually take a lower voltage for example 12v, and change that to say 25,000 volts to ignite gasses in a bulb such as HID or fluresecent bulbs. Im not sure if the voltage number here is exactly correct as im just going off the top of my mind but the principle is what im sharing.
Therefore, whether you need one module or two module depends on which rings you buy. usually each one needs one. Would a 70mm ring fit? Hopefully someone gives you answer but you will probably need to dig and do more research to find your answer.
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