RootsRuler
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Imo use both switches on and back the light up a bit. Taking advantage of both blue and red receptors for photosynthesis
I've been using Blurples for a while now and have never used both grow and bloom at the same time. That being said, if adding in red will elongate internodes then FOR SURE I don't want any red spec in the lighting since GG4 stretches like crazy if you don't know how to control it. Right now I have a blurple on grow only and a white light that I just bought. I haven't seen a difference in internoding between the two and the white light has both red and blue blazing away so my experience hasn't shown what you are saying! Maybe the blurple has enough red LED's in its grow phase to fulfill what the plant needs. Not sure. Just know I haven't seen what you've described.The red will lead to longer internodes (more stretch) if thats your goal though