Trust me, if you are not getting 16-18 or more hours of light your plant is not going to be very big nor is your yield going to be very high. Consider setting up an indoor garden if you have an extra $2000 and some time.
-K
1 x 400 w HPS =$150
1 x 400 w MH = $145
4 x 600 mm x 300 mm black plastic crates = $80
Irrigation hose + fittings = $25
Timer, power board and cords =$50
Water pump, fan, water heater and aerator = $80
Veg/bloom base nutes, PK 13/14, potash = $100
White plastic, duct tape = $20
Intake/exhaust fans, controller and duct = $150
$2000?! I was getting a over a pound of weed every 3 months from a $800 wardrobe setup