With GLR there will be some pistils... It takes cannabis to the brink of flower, but does not let it go into flower. GDP does go into a pseudo flower, but continues growing quite well. My GDP grew under GLR for about 5 months as a mother/donor plant and she did stellar. There were some pistils that showed up, but never went into flower until I put her into flower. Once into flower she did transition VERY nicely in three days and had no stretch.
jandre is spot on with his answer, all my plants under glr show sex at around 2 weeks old, it throws out pistils where it can but no buds will form and the plant will grow like crazy till you flip the light to 12-12