I think we can all agree that lights don't cause ich. It may very well be that with the new intensity and color spectrum, that you are only now noticing the ich splotches on the fish.
Keep an eye on your fish and feed them a variety of foods. My powder brown seems to have developed ich (my stupidity), but is not showing any signs of decline. I think that a healthy fish can overcome ich, but won't hesitate to take it to the next level if required.
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