I'm pretty strict about the sort of help we give on electrical questions, because electricity and pools mix FATALLY. And at the risk of offending you, I'm going to simply say, your question "Is that green line important?" tells me beyond all doubt you should NOT be working on this yourself.
Hire an electrician, or at the least a buddy who understands "that green line", or else turn the breaker to that light OFF . . . before you kill someone in your family.
Sorry . . . .
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