I'm going to ramble about indoor, sometimes not too coherent, but grown inside for thirteen years.
Reflectix way better than mylar, it is textured for no hotspots. Used both for years at a time, I pay for reflectix where shiny is needed.
Actual side lighting is better than anything reflective. 30% of the budroom lighting is from the side. The yield is 15% more than reflective sides. This is my day job, sidelights are not a cut in pay.
Veg table is all fluorescents, 33% of the veg table lighting is from overhead. I build a tunnel of fluorescent fixtures with the top edge of one side on pivots for access to the plants.
I put in a small test budroom. I test new lights, various spectrums, efficiencies of sidelights, etc. I have been paid back many times over by incorporating findings into the main budroom.
Our sizes are similar, I have 5000 watts in 10 x 10 mainroom, and 1000 watts in 8 x 8 test room.
600 watts on 4 x 8 veg table, and 200 watts on 2 x 4 clone table.
The veg and clone tables can outpace the budroom if I am not careful.
The room sizes are room sizes. The bud grow areas are walled by sidelights, 7' circle and 3' circle.
Veg table is currently 2' x 4' between the lights and is expandable with more lights.
The venting of the mainroom takes one CFM for every two watts. The test room takes one for one, I blame this doubling on not having crossflow inlet and outlet. In and out on the same door. This gives half the efficiency of in the bottom, across the room, and out the top.
Oops, cooling will depend on climate, I'm in the far north, your needs will be different.
Now for personal preferences, what I like that is not necessarily better, but is how I do it.
The 5000 watts in the main budroom, a 7' circle is 38 square feet, 130 watts/square foot. Sounds like a lot. The breakdown:
10 x 400 watts discharge toplights, four separate spectrums.
32 x 32 watts fluorescent sidelights, red aquarium through UVB lizard lights.
I find I like the results best when light is hitting the plants evenly from every direction possible.
Underlights have been CFL and white LED, neither was satisfactory.
Plants are 8-12 per tray for sativa and 2-4 per tray for indica. Three 16" x 35" trays fit at a time in the room. Staggered for a tray in/out every three weeks.
All plants together in a tray must be the same clone, no exceptions. If the roots of non clone plants intermingle they both stretch fiercely forever.
Clone mothers are singles and gets budded after two sets of clones are pulled. Usually in two gallon buckets yielding 4-8 oz.
Odd extra clones get put in whatever and stuck in corners, left in an 8 oz cup they grow no branches, achieve 10" and 7-10 grams.
Root binding determines size, a quart will get a whole oz usually.
Electricity usage is 3500 kw per month, during lights on the furnace stays off, that's with today being minus 27 F and dropping. Lotsa waste heat in the summer.
Being older, the rooms come from the children having grown up. Most of my setup is for my convenience and lifestyle. It is a good producer, low stress, and usually fun to play with, test room and all.
A straight commercial grow would not resemble my operation at all. I am a gourmet shop with twice the fixed costs of comparable grows I have visited.
I rambled at length because with a 30 year hiatus I am thinking your situation may be somewhat similar. Keep it fun, work was the old life.
