I don’t know if it will actually do anything it’s just a function on one of my uv light bars so figured it wouldn’t hurt using. Here’s the actually wavelength chart it doesn’t look like it goes to far past 750 so it’s mostly just extra far red. What I read says to use it 15 mins before lights on and after lights out to kind of lull it asleep and awake or something lol. Just as nightlight explained here. But they were fine no worries they looked just as fresh as they usually do in the morning.didn’t say it was, it was you who said ir light is useless to photo plants..