The plant is literally growing into the light? I should be a little more clear. I almost always have between 12-18" between my canopy and my light fixture. Depends on their life stage. I generally have it around 12"-ish during flower. Since we moved I'm only running my 4x2 for the time being. That's a gorilla shorty with a 2' height extension. It's kind of a PITA to raise anything once it's higher than the original shorty roof height of 4'11". I literally have to snake myself up into the height extension, which is like a little tunnel to make adjustments sometimes. So once we get to a point where the plant isn't going to get much taller, I generally set the height and use the dimmer. If something is getting blasted, then I will raise it. I'm not complaining about the ability of being able to add height extensions to gorillas, it's awesome. But it can be tricky at times on a short tent like the shorty.
Some strains don't like, or want a lot of light either. The FB zkittlez was one I grew last year that comes to mind.
