First off, I would never post a post like this on my own but you asked soooo...........
About $12-13k on my room.
8'x8' Sealed room with 4'x8' grow area.
Equipment:
-Trolmaster control/surveillance system.
-Bottled CO²
-Auto-Watering System
-3× Spiderfarmer SF 4000 lights
-Quest Dehumidifier
-15k BTU Air Conditioner
-PAR Meter (A must have)
It doesn't seem like much for what I spent but the AC, Dehumidifier & Trolmaster system were about $7k. And there were lots of other costs like small equipment such as pots, ph pens, flood tables, wall coverings and building the room with 2x4 construction, drywall, and sealing it all up. It all adds up and I think to buy everything today could run north of $15k canadian.
After I built the room my first crop was 8 plants and I got almost 6lbs. Then I switched to a living soil blend in 4x 20 gallon pots and my last crop was 3.7lbs and this crop also had my first 1lb indoor plant ever weighing in at 512grams trimmed and cured. Since switching to living soil, I only add un-ph'ed tap water once a week and thats about it. No food, no teas, nothing. Simplest system ever.
Current Grow
First grow. Just under 6lbs.
To say the least this grow room has been worth every penny.