Yes I must have the older model. Only 2 modes.
Not surprised at all about the upcoming A51 model having more red. The all white XGS-190 is a stellar vegger, but I wouldn't recommend it for flowering--at least not on its own. IMO you'd really need at least 2 of them to truly flower out a 3'x3', but even then I suspect you'll end up with airier buds.
Vegging with the XGS results in tight nodes, and enough penetration to get you through those first 18-20 inches of growth. I have tried the light at everywhere between 18-24", but 20" seems to be the ideal balance of coverage and intensity.
2 weeks after switching to 12/12 I noticed slower than usual bud development from my clones, so I decided to add in eight 4' bulbs of 2700K T5HO (~400w). Within a week of adding supplemental T5s, the clones more than doubled their growth rate and buds just exploded everywhere.
I'm hoping my new
DIY COB panel will work slightly better at 3000K, since there is a significant increase red light.
Disclaimer: My test is only pseudo scientific. I am using clones from the same mother as my previous grow, and in identical conditions (other than light source). Since I have not done this with a larger N-population, I can only presume that results may vary.