Lighting & Ventilation
Reccomendation Calculator
https://cannabis.community.forums.ozstoners.com/calculators/lighting.php
with 9 x 21 x 8 put into it.
I suggest you use the electrical calculator too for a room that size.
https://cannabis.community.forums.ozstoners.com/calculators/electrical.php
Minimum Lighting 25 watts Per Square Foot Lighting
The minimum recommended lighting for your area is
4725 watts
Ventilation
The minimum flow rating of your fan should be
1260.0 Cubic Feet per Minute (CFM)
Power Requirements
This setup will require
25.6 amps to be available at all times for safest operation*
Optimum Lighting 40 watts Per Square Foot
Lighting
The optimum reccomended lighting for your area is
7560 watts
Ventilation
For optimum ventilation the flow rating of your fan should be around
1386.0 Cubic Feet per Minute
Power Requirements
This setup will require
41.0 amps to be available at all times for safest operation*
Maximum Lighting 60 watts Per Square Foot
Lighting
The maximum reccomended lighting for your area is
11340 watts
Ventilation
Going this way you will require a fan with a flow rating of at least
1638.0 Cubic Feet per Minute
Power Requirements
This setup will require
61.4 amps to be available at all times for safest operation*
Additional Comments
Getting to these points and or over it is highly reccomended the grower use Co2 in their room as your plants will only be able to photosythesise a certain amount of light before needing a Co2 boost to benifit