flourescent for vegatative stage followed by hps for flowering

[bib fortuna]

flours/ by type

these are not exact numbers but is what i can remember off the top of my head, after looking at soooo many types of cfl's, hps's, and flours.

t12-60-70 lumens a watt
t8- 65-75 lumens per watt
t5-70-80 lumens per watt
t5 ho- 92-100 lumens per watt.

while mh bulbs are 120-140lumens per watt
and hps bulbs are 140-150lumens per watt.

and what i was refering to is that 20 1000 watt hps, is enough to have a garden that is enough lights to cover a 150'x150' ROOM. You will have to watch out for Light burn, as if you setup your lights wrong, some will get to much light. Adding co2 to your setup would help alot with this problem but will not solve it. Not to mention that to add co2 to a space this big would costs some serious $$$$

thanks. and sorry if i bit your head off earlier. the room is 50 x 60 or so.. maybe 50 x 70. I sort of thought 20 would be too much in there too but i havent taken measurements yet.

[GratefulDawg]

If I was you, the first thing (and I DO MEAN FIRST) I would have done is measure the room? Yeah, that makes sense to me. 20 1,000 watt lights IMHO will be too much for your room, though like you said, you haven't measured it yet. Way to go, stick your neck out there talking about a 20 light 400 plant grow that is going to happen, when you don't even know that it will fit!? Anyway, I am not being rude buddy, I (and president teddy roosevelt) am just saying this :

Speak softly, and carry a big [weed] stick, you will go far.

I mean - tell no one, and be ready to do "battle" when the time comes. By battle, I mean arm yourself with knowledge of your local laws regarding plant numbers, as well as any other information you can get your hands on. Obviously, please don't go outside and actually get a tree branch to hit someone with, but be aware of the dangers out there. Good luck bro (or bra), and peace!!

PS - I wanna see pictures of 400 plants being harvested ha! My hands are hurting thinking about all the trimming that would be involved.........:jointsmile:

[the image reaper]

general rule-of-thumb coverage for a 1000-watt HPS is a 10' x 10' area, but I'm sure you could add more wattage/sqft if you desired ... an old Rosenthal growbook claims maximum results are obtained at 60-watts per square foot, anything more is probably wasted ... I don't know how true that it is, as different types of lamps differ in lumens/watt ... :smokin:

[Chronisseur]

Is 3500-5000 lumens p sq.ft accurate?

[princedapimp4]

all i have to say is running 20-1000 watt hps is going to rape your electricity bill costs, not to mention to extreme amount of attention you will have to give 400 plants. it is hard to grow 40 plants, let alone 400.

[stinkyattic]

Yup- my max was around 200 and hand watering all those bitches was, quite frankly, a bitch.
I'm much smaller these days, and more efficient to boot.

[crazywill]

Well has anyone seen the new water cooled tube lights?Liquid Lumens But $400.00 a light is way out of the budget.Water and electric I dont know if thats a good idea.If theres no heat this would be good for small grow spaces.What do you all think? PEACE
:rastasmoke:

[ProGroWannabe]

I think it's a great idea. Just waaaay to expensive for me.