Help. How often should I or should I change my reservoir water.

Compact fluorescent lights, HPS, MH AKA HID are the lights that will work for you. Read up on MJ lighting needs and you will get more info than you will know what to do with.
Adieu

Well if it helps, I have a 400w on 2 plants and it's frankly not nearly enough. I also have a 4 ft shop light for some side light, and 2 cfls. Still not enough, lol.

But if you dont let them veg too long, then maybe I guess if you scrog or lst them so they're flat and not too deep of a canopy.

400W's can do wonders, but I don't want to get anyones hopes up to high, but on OG many life times ago a fellow pulled a LB from a 400W with a 16 plant SOG type set up hand watering, but he was called a master by most. Just don't knock the 400W.
Also, Jamstagader right here on our board pulled a LB off a 400W with 200W's CFL side lighting in a scrog in a cabinet grow.
Adieu

I like my 400watt well enough. I just let the plants get too large before starting to flower, so now I'm working on side lighting, and anchoring my light first to one wall, then letting it hang in the center, then anchoring to the other wall everyday. It's the only way to at least get some light penetration during the daylight. So for 150w I think you need to think small, think scrog, think LST.

If I grow more, I'll get or build a screen and definitely do a scrog grow, or flower very early so I dont have to pull off these cobbled together feats of engineering to get enough light to the buds.

150watt for 6 plants, they need to be kept under a tight control of some sort I think.

Change the water once a week, liquid oxygen is good to put in once every 2 days too. Just a tea-spoon full in the res does wonders.

Whats a good liquid oxygen product brand.

Thanks

There are lots of different suppliers probroubly but they're all the same. Hydrogen Peroxide is the proper term.

Would just hydrogen peroxide itself be okay to add to the rez?

Peace

PM_Bigbud, buy this and save yourself a hassle

High Tech Garden Supply

thanks socialistpete but I was gonna get a 400w mh for $139.99 at my local store.