A Question On Lighting And Amount

hi im thinking on steping it up a little im gonna use 4x 600w high pressure sodium lights in a room. wot would yous think in amount under that amount of light thanks for any feed back

well there is a kind of ideal lumens per square foot rule but for the life of me i cant remember the amounts but you could View attachment 1521586easily fit 20-30 under that lot, also when you find out the lumes/sq ft thing this should help you work out how many you can have under it/them View attachment 1521585

try this thread out.

https://www.rollitup.org/newbie-central/162543-lumens-per-sq-foot-x-2.html

the maximum is usually considered 10 000 lumens per square foot.

though sometimes 7000 without co2.

by personal experience its not quite true, you do see increased growth over 10 000, even without co2, but its miniscule enough not to worth the effort of cooling that extra light. though i have not tried those figures with co2 in a enclosed enough environment.

I have just over 10k lumens per sq/ft 400W HPS (48000 Lumens) in a 4.5 sq/ft box and my plant loves it! Bulb is in a cooltube and with a 200CFM fan blowing through it and i hold temps at 80-85

4 600's will optimally cover a 6.5' x 10' area. Its "optimal" which means you could get away with a little less

id do them in an 8X8 area, get large hoods and do 9 5gal root pots under each.. ( but i'd go with 1000's )

phil4567 said:

hi im thinking on steping it up a little im gonna use 4x 600w high pressure sodium lights in a room. wot would yous think in amount under that amount of light thanks for any feed back

Click to expand...

13000 lumens per square foot optimal. I base this on all the seed companies and other growers use a 1000 watt HPS in a square meter tent,
or a space that equals a square meter. 1000 watt HPS = 140000 lumens. Square meter is 10.7639 square feet. 140000 divided by 10.7839 =
13006 lumens. So 4X 600 watts, @ 95000 lumens each, I'd go with 29.21 square feet to maximize lumens, and space. Remember, after the
1st 12", you lose 1/2 your lumens per each 6" thereafter. Make sure if you use HPS, especially 2400 watts worth, get some pretty good active
ventilation.

And, 1 plant per square foot. I hope this helps.

thank for ur advise see im not clued up with the lumens per area but a friend said usully 100w per plant.think im looking to be a bit greedy an c if i cud squeeze a few more than 20 in but i want a nice yeild still.but u's think a little more than 20???? thanks

obvious with the right size of pots etc