I've never heard of lighting causing an increase in nitrate. Not directly anyways. Occasionally someones lights blow up or catch on fire or something and kill much of what is in their tanks. Then what dies would breakdown into nitrate but thats a pretty extreme example.
What is your current water change schedule?
What brand/model of skimmer do you actually have? Don't trust what the manufacturer rates them for as they usually exaggerate. A properly matched skimmer should be able to bring your nitrates down to undetectable levels on its own.
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