Dimmable ballasts will use two ports as they are dual mode and can be dimmed independantly, however you can wire them together.
LED sticks and spots use two ports as they are dual channel.
Tunze use one port each.
Do not mix and match tunze with dimmable always have running on sperate ports i.e dimmable on L1L2 and Tunze on L3L4
if you are out of ports you can use the PLM-4L card.
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