Oh, also, observations: Less stretch overall and same bud yields but with slightly faster finishing. Plenty of resinous trichomes as usual. It sounds like magic and well, it kinda is.
You can switch the cycle at any time. Some strains will definitely act differently, and I recommend to make sure your light timer has a battery backup because it seems important to have consistent timing for the cycles. I have had one strain that, from seed, decided to start flowering about 2-3 weeks after popping but all the others are great.
My Tahoe OG cut shows trichomes in veg and internodal spacing tightens up to 1/4 to 1/2 inch under 12/1. You can really tell it's a special plant.