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are there any desired effects of having the ph at either threshold of the spectrum, 5.8 and 6.8?In other words, what positive effects manifest from slightly more acid water over alkaline, and vice versa?

let me state the relevant schematics to my grow room to better understand my situation. i have a closet space which i've managed to convert into half veg area and half flowering area. the flowering room is 52inx 24inx 8 ft. i have a 6inch duct running from left to right, bottom to top to bottom...

is topping a 2ftx4ft sea-of-green a good idea? why or why not? any recommended methods of boosting the amount of yield?

i'm going to replace my 1000w ballast and buy two brand new digital 1000w dual (hps/mh)ballasts - to be able to use a hortilux super blue bulb. does any one recommend a brand, or online stores. your thoughts are greatly appreciated.

i woke up this morning and to my surprise the hps light had not turned on in my flowering room. i opened the space and discovered the bulb emitting a blue glow but no sun light. did my bulb burn out or do i need to replace the ballast?

can i use a blue light to light the flowering room during 12 hour of darkness instead of a green light?

i opened my flowering space today and discovered a white residue on the tray table and some other layers or gunk. i think it's from the nutrients and CO2 but i'm not certain. any ideas?

how much yield should i expect, given all other controlled variables are properly managed, from (9) 10in - 12in whitebarries, w/1000w hps, mylar, co2, nutrients, in a 22in x 44in x 5ft height space? any advice on how to get the max yield? does the have to be inches away from the plants or can...

how much yield should i expect, given all other controlled variables are properly managed, from (9) 10in - 12in whitebarries, w/1000w hps, mylar, co2, nutrients, in a 22in x 44in x 5ft height space? any advice on how to get the max yield? does the have to be inches away from the plants or can...

i have a problem. i have a 52 inchx2 ft space (8ft in hight) w/1000w hps flowering 7 whiteberry 12' plants. my lamp is contained within a 6 inch tube thats connected to a blower. still, the temp is way too hot. i tried making my own airconditioner by using an ice-chest, tubing, a pump, and...