Still working on getting the seedling room ready. Ran 3x 20 amp circuits in there for lights. Waiting on more lights to show up, and growing medium.
A pair of 4' T5 lights from growace.com are MIA. Never got shipping information from them, ordered 9 days ago. Opened a ticket with them to find out where the hell they are at.
Took delivery of 40 cu ft. of vermiculite and 40cu ft of pearlite yesterday. State is slow getting sales tax forms ready though. Got the ID # this week but 7-10 days for the paper copy to arrive that the vendors need.
Weights are to hold the grow mats flat while they get used to being un-curled.
40,000 lumens per 4', 10,000 lumens per 1020 tray. Light works out to 54w per tray. Should be enough.
When this room is done it will have 2,592 sprouting cells occupied.
Gotta get working on the loft at the farm, that's where 4" transplants will be done as first true leaves emerge.
Will require a LOT more square footage at that point. (288 sq foot for each 'leg" of the grow). While I can fit 576 seedlings on an 8' table, I can only fit 180 4" pots per 8' table. Each "leg" of the grow transplant will require 15 tables (well, 14 1/2 tables, anyway).
If I double up the tables I can make more efficient use of lights (which I need to do as the building I'm doing that in only has 100 amp service right now; and my initial calcs for lights were 122 amps continuous.. which isn't gonna fly).
So plan is two rows of tables down the middle of this; 15 in all (skipping one for the stairs)
The problem is this constrains me to about 2600 plants, which is about half of what I wanted to plant out.
But it is what it is.
Electrical will go down as follows with that in mind;
For lights there I'll have a limitation of 80% of my 100 amp 240v service entry, or 19200 watts. Each 8x54w T5 high output bank of lights is 432 watts. I have to use 20 amp 120v circuits as 30 amp are disallowed per code for lighting w/ T5's. I can't exceed 1,920 watts per 20 amp circuit using the 80% rule. This puts me at 4 lights per circuit (1728 watts each circuit). I can have a max of 44 lights (19,008), split on 11 circuits.
With 15 tables planned, 2x lights per table would be 30 lights. I could do this on 8 circuits, but 10 circuits would be safer (each circuit would be loaded to 1,296 watts, or 10.8 amps, just over 50% rated limit, instead of pushing them to 80%...).
So lights will be mounted (generally) cross section, with 4 lights per 2 tables like this;