it seems like when u use a cool tube horizontally you lose alot of light. do most people agree putting it vertical. just seems weird having the plant grow sideways to the light. idk would appreciate info
I cool mine with a ruck 200m inline fan. Depending on the wattage, the best way to figure it out is to take the wattage of the light, i.e 600, add 20%, then divide by two, that is the min rating of fan needed...i.e a fan that pulls 360 cubic metres of air. (a 600 fan needs at least a 5 inch (125mm) ruck fan - or equivalent make)
Go to icmag forum they have a whole sub forum dedicated to vertical grows. As a newb, looking for the same thing as you, that forum had exactly what i needed.