what am i looking at for an ultimate height and yield off of 3 week old seedling placed under a 1000w hps from 125w cfl?
The short answer would be:
"Undetermined due to lack of information"
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The short answer came after I was done writing out a long winded bubble train thought process. I'm sorry. If you continue reading, you're waiving all rights to judgment
(Ramble)
Precisely.
Age determined from time of seed (growing) is a long process, but well worth discussion if an interest in any on the following are present:
1) Bag Seed curiosity. (we've all had it at one point or another)
2) You are growing out Genetic/Strain/Pheno for breeding?
3) Autoflowerpower!
4) other
With this we turn the coin over and look how a plant is grown from a clone. To clone...from a mature enough plant that it was able to give clones without Charlie Brown'ing on you and dying.
At this point, a healthy clone a week in the dirt, and a young seedling (this means "sprouted from a seed, popped a tap root, and grew a few leaves with distilled water in a gentle/neutral medium") look very similar on youtube and in pictures. But it is in the plant's cellular maturity that flowering can be unlocked.
The clone is an isolated part of a mature branch.
The seedling is not.
An arguable observation is my spelling and grammar are bad. Another observation is that it could be ideal to continue growing the seedling in question with it catagorized as "Long Term" or your Mother plant. From this seed turned Mothership, clip clones, root 'em, veg'em to season*, isolate them from the mother (who is still growing on 24/0) in 12/12. At this point, you can 12/12 at three weeks, two weeks, one week, or just for fun (not mocking) you can throw them into 12/12 from the start.
Various seedling strains lack the maturity to survive, but I think equatorial's might have a chance?
* "Veg'em to season" - For each individual grow is a unique vegetative period. Factors include but are not limited to:
~Preferred height to begin flowering or finishing height
~Space limitations
~Chosen grow/training/manipulation method (SoG, ScreenoG, mother, indoor, outdoor, with a trellis, without, etc)
~Finished weight (Think about the perfect ideal strain combination for your personal taste. Add to this the ideal medium, nutrients, and grow environment including height. With every condition controlled and a few cycles of growing clones from the same mother, you will be able to determine the genetic predisposition of your mother's ability for growing weight.
With this information, square footage and time permitting, you could keep a plant in veg while topping, FIM'ing and supercropping to the absolute threshold of the plant's flowing ability, AND THEN flower it to a Guiness Record of a single plant producing a 2.25 kilo crop.)
Some choose not to go this route. They have one or more mothers. From these mothers, clones get rooted and flowered.
As a side tracked thought: would anyone care to share the longest they have kept a mother alive?
(/Ramble)