Grams per plant?

Sounds like that is going to be a low amount of light for that area.  If I am not mistaken, a 200w hps is good for a 2'x2' area.  Two of them together should be good for a 5x3 area which is less than half of your grow area.  Depending on your training methods, you might pull a zip per plant.  Since there are many variables,  it could be as little as half a zip per plant or as much as two per.
 
What I do know for certain is that you are not gonna get 500g m/3 on a first grow using a couple 200w HPS.  Those yield numbers are based on experienced growers using 1000w lamps in a commercial quality grow room.

 

eh usually these numbers from the seed banks are based off of 600w lights for indoors, and obviously the sun for outdoors, but who's counting?
to answer op's question, getting proper lighting is entirely based off of how much area you have. So let's do the math:
 
you have a 6x6 area, which means you have 36 sqft of workable space.
The sun produces approximately 10,000 lumens per sqft on the earth's surface at the equator. Marijuana's best growing conditions exist between the equator and about 45 degrees to either side, depending on the season, of course. So, given the difference in sun heighth between seasons, which is 23.5 degrees, we can assume that growth in nature exists between 7k and 10k lumens.
(now, I know there's a whole slew of people that will say 'but dish! plants grow through PAR values not lumens!' to which I say, 'yes, yes, I know, but if we are measuring our general intensity of light using lumens for both the sun and our lights, they can essentially cancel eachother out, and we end up with a relatively accurate guess for our actual lighting. it's not a perfect guess, but it's close enough for what we're doing')
 
so we're looking for 7k-10k lumens per sqft. given that a 1 kilowatt hps light averages about 150,000 lumens, we can safely say that this light would be optimal for a 15sqft area. so if you have a tent that is 4 feet by 4 feet, use a 1kw light. they're practically made for one another! or even better, 2x600w lights. if you really want to go crazy, 2x400w hps, with 2x250w mh lights strung between to mix spectrums. but again, that's being really picky.
 
so, for the OP's area, in 36 sqft area, you'll want about 4x600w lights. remember that depending on distance from the plants, the bulb's intensity will fade. so I suggest with a 600w you want to rig cooling systems so you can drop your light to about 10 inches off the top of the plant.
 
I guess my point with all this is, for your first grow, maybe don't use the whole 6x6 area. but build your system so one day you can utilize the whole thing. so start with 600w knowing that you'll be buying 3 more as you get more experienced and wish to expand.

 

iu agree you need at least 50 watts a square ft. so you need a total of 1300 watts. at 500 watts you would only reach a .5 per watt ratio, and most growers only reach a .3. at .5 you would only reach 250 grams and thats less than 10 ounces, and your bills are probably higher than that.  But the sucky part is trheres alot of other limiting factors besides lights, like air circulation, exhaust, room temps, bucket temps or soil mix. humidity, c02, p.h, ppm's during levels of feeding, genetics and so forth which can lower your yield from that .5 per watt yield.....even the type of light bulbs and whether there new or not, and training.  Im not tryna disvcourage you but alot of growers go in and become disappointed and never grow again, and I dont want that to happen here.....do some more homework on the matter.   Were here to help each other.

 

oh and don't grow tangerine dream. it's a terrible strain. if you want that same citrusy-ness go with tangie. it took the cup this year.

 

which country are you in? 300 euro wont get you much, especially with a 3x9. I have a 90cmx90 and a 600w and the whole setup cost me about 600 euro

 

I have tangerine dream going and I am excited as hell about it. The pictures I seen resemble an impressive looking strain I used to take care of as far as plant structure, height, and the buds looked dense as hell.
 
Prolly just one of those strains that needs real lights to grow lol

 

for 600 euro I got a 90x90 secret jardin tent, a 600w light plus cooltube and ballast, ducting and fan. I got two oxypot dwc systems. nutrients ive spent around 50 on so far, im picking up some cannazyme today i'll probably end up spending 90 total once I have everything I need. so about 700 in everything not including seeds.
 

I've heard they're very inconsistent. did you go through seed or clone? and tangie I've heard nothing but good things about, and DNA genetics usually puts out good stuff

 

starfish and watermelon works wonders too

 

where are you seeing 150 euro hid kits? i see ballasts alone are 130 euro without light or reflector. and tent is definitely the way to go. i tried diy before I'm never going back to that.

 

oh well yeah, those kits work fine I though you meant digital ballasts. which run cooler and more efficiently. and those don't come with air cooled reflectors. neither of which are necessary, but that's what I thought you meant by your post.

 

looks fine, you'll definitely need an extractor fan to get all the heat out. and without a cooltube, you'll definitely want just a regular swivel fan or two inside your grow area to keep it cool. those 600s can get pretty warm without an aircooled rig.

 

the cheapest way to bump up ,certainly the spread of light is to buy a miltipack of 23w(i think is an optimal rating easily found at any diy store or supermarket) warm light (for flowering) chuck a couple of cool white in for full spectrum if you're picky but its not necessary . ps those reflective paper plates or meat pie trays and stickytape make great reflectors happy (cheap) bodging

 

I got 9.2oz off a 250whps

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