keep in mind that it will double to triple in size during flower.
Shake, during the last 2-3 weeks 'Zard and I have been learning how to contol this.

WhiskeyTango noted, early on, that putting his Procyon too close to the plant would make it seem to stop growing.

I've got separate control for red and blue on my homemade light, so I figgered out to slam the plants with blue when you first flip them to 12 / 12. Stopped them in their tracks, stretch-wise. (This is prolly what WT experienced, I'd replicated it with a Procyon after he observed it.)

Thing was, the blue emitters on my homebrew light also made flowers pop like crazy, usually in 5 days. The closer to the emitter, the more pronounced the effect. This'd certainly be helpful if yer trying to determine sex. No big deal to me, jes' got some girlclones so no mystery there.

So, I'm not ready to drop my pants and shoot off rockets over early flower; I'm not sure how that relates to the many other changes the girl's gotta undergo to produce proper meds. But there is definitely a ton of control to be had when you're just manipulating these two spectra.

Weezard then figured out to also reduce red at this point to control.....well, I don't know what he's figured out yet. I'm such a heathen it would never have occurred to me to hit the plants with less than full power at at least one spectrum. But during early flower, individual red and blue control (sometimes not running "full power") lets you really manipulate things like stretch (and rate (and location!) of floral development).

One thing we both seemed to notice (W., correct me if I'm misstating this) was that once you've got enough blue, for whatever developmental stage you're in, additional blue is ignored (sort of). So why waste watts / heat?

Well, I'm rambling a bit here, but I'm comfortable claiming I can hold down stretch to 25% pretty easily. 20" veg plant in, 25" buds out--in that range. At least with this strain, WTF it is.