how many lights?

Hi all i am constructing a 2m-2m grow room how many light should i have in there? i have 2 600w and 1 400w hps will this be sufficient?
many thanks from the freeman

Enough to supply between 50w and 66w per square foot of canopy space.

2 meters is about 6.5 feet so you're looking at an area about 42.25 square feet.

If you were to use all that space for canopy you'd need 4x 600w HID's.

If wanting some walking room on all sides you'd use a 5.5x5.t area of that room which is 25 square feet of canopy and would want 3x 600w or 2x 1kw HID's.

6 x 6 approx... i would say 2000w maximum for that space.

1600 should be alright though

I would face the 600w in same direction but space out good. put the 400w in the middle of them facing the opposite direction

your lights are fine. i`ve run 1 600 in a 5x5 and pulled 14 oz. i`m running 2 in there now and it`s more than enough for me. i use my 400 for veg. an extra 1.5 ft all the way around wont hurt anything.

plants dont read watts....
we calculate/estimate the size of the finished plant(s) and light the grow space accordingly. the sun avgs 7k lumens per sqft and max's at 10..interestingly enough our beloved plant has adapted to this, likewise 10k consistently will bleach, 2100 to maintain photosynthesis, 5k min for half decent bud

2mx2m. 2000w ideal. 1800w great. 1600w good. 1200w ok.

if i were you i would buy 1 more 400w hps so you can hang the lights in a square rather than a rectangle. assuming temps are under control.. if temps are high you might as well just run the 2 600w hps

when i say watts I assume the lumens/watts is 70 or greater. typically 125lumens/watt though.

I get pretty good results from 76 watts/square foot. Led/+uv/ir/dual arc combo

thanks heaps for the input guys much appreciated..still not sure what to do, i am going to be running everything of solar electricity is way to expensive in my neck of the woods. the room has A/C, one more question can i swap out hps bulbs with mh for veg?

Lumens is a measure of light visible to humans and while we use these units in selecting our gid lighting they really don't have shit to do with plant growth. Par watts and spectrum is what matters. Good luck with your grow

have a quote
"Lumen is a measurement of light output. It refers to the amount of light emitted by one candle that falls on one square foot of surface located at a distance of one foot from the candle. Traditionally, lumens have been the benchmark of a lamps ability to grow plants; meaning the brighter the lamp the better the plant. However, studies have shown that a broader color spectrum lamp will perform much better than a lamp with high lumen output, especially when it comes to plant growth.



The total visible spectrum is perceived by us humans as white light, but the "white light" is actually separated into a spectrum of colors from violet to blue, to green, yellow, orange and red made up of different wavelengths. Plants use the blue to red part of the spectrum as their energy source for photosynthesis. The different combinations and the relative intensity of various wavelengths of light determines the CRI of a light source.

Only part of solar radiation is used by plants for photosynthesis. This active radiation Photo synthetically Active Radiation (PAR) contains the wavelengths between 400 and 700 nanometers and falls just within the visible spectrum (380 - 770nm). The light in this region is called PAR watts when measuring the total amount of energy emitted per second. PAR watts directly indicates how much light energy is available for plants to use in photosynthesis. and why we select mh or hps"