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What is the purpose of the metallic donut?

ISAslot

Platinum Member
When I got my enlight 7237 I noticed that there is a metal disk with the led/power wires looped through. What is the purpose of this?
 
It's a choke, to reduce noise in the lines. But for an LED, I don't really think it's all that necessary, but as long as it's on there, might as well leave it alone.
 
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