I just saw someone else with the same question about infrared.
ANd I gotta say, this just doesn't make sense to me. I mean, if plants are used to growing outdoors, and there isn't just infrared light outside, then why would you try to grow plants with that light?
Plants need full spectrum light, of course, not when you want them to bloom, but when you're growing, you need to have all the colors of light in order to grow healthy plants.
I know the infrared light sounds like a cool idea, and there are certainly a lot of sites which make it sound like the only possible option.
But it just doesn't make sense. I haven't used it and I don't plan to use it.