I've never modelled power servicing to lights as I would consider it over-detailing.
But if I had to do this, I would be thinking along these lines.
What elements are fixed in size, what elements need to increase/decrease in size parametrically and what elements are associated with other elements.
In my mind, your 2 grey light elements and the curved elements of the power cord are all fixed in size and should be locked in place to each other. Use references lines to do this. The power cord descending down and the support cables descending down will increase in length to suit your light suspension height, so they both should be locked to reference line A at the top ( I assume this is your ceiling plane) and the reference line B at the bottom ( A fixed distance above the lighting fixture). A distance parameter between A & B gives you height flexibility. Ref Line B should link to the lighting elements and cables, such that if B moves, they all move with it.
So step 1, setup ref lines A & B and its length parameter
Step 2. Setup ref lines below B that are locked together.
Step 3 model cables/services between A & B.
Step 4 model light elements/cable fixings/power cables below B and lock them to the ref lines.
This should resolve the Z plane.
In plan, I expect a central ref line will be necessary and all elements should be locked to it.
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