4 x 400watt HPS's

[co dee]

How many plant can i fit under 4 x 400watt HPS's is i only veg the plants for 2 weeks and how much room will i need?

Thanks.

co dee Reviewed by co dee on 06-19-2006. 4 x 400watt HPS's How many plant can i fit under 4 x 400watt HPS's is i only veg the plants for 2 weeks and how much room will i need? Thanks. Rating: 5

[bongerstonerd00d]

Why not two 1000 watt HPS? Cheaper, less heat, more lumens. How many lumens you want per sq. ft. will tell you how big your grow area can be.


b0nger

[co dee]

Im looking to grow veg 50 cuttings for 2-3 weeks then put them on 12/12, the room will be my veg and flower room.

Thanks.

[Bachelorpads]

My recommendation for that much light:

8x8 space
one light over every 4x4 (gives 25W/sq foot which is a bit low but will work)
SCROG the entire area with one plant per 4x4 square.

It will take some time to fill the screen this way, and if you are in a hurry and don't mind the plant numbers you could do 2 plants per 4x4 space.

With a decent strain you would pull 2lbs+.

I would expect about 4lbs, but that is with a heavy yielder and I know a little bit about the process.

I hope that helps. I really hate to have a lot of plants.

[Zandor]

Thatâ??s a lot of plant for a little light. 400w is only really good at 16â?� above the canopy. At best and that means even 3x3 is pushing the area for proper light coverage. The hood you use will determine your light coverage area. Just light one up in an open dark space. Raise it to different heights and measure the light pattern on the floor. That is how you measure the light pattern of the hood. Build your grow area around that information and you will have better light coverage.

For example:
A 400-watt MH from 0â?� to 12â?� is about the same luminance say 55000
Same light at 24â?� the luminance is now about 30000

Still good but the edges of the light pattern have degraded. At 24â?� and the floor pattern will show you the light is now only good for about 30â?� square inches of quality light.

Now

Same light at 36â?� above the canopy and the luminance is now about 1200. See the big loss in just 12 inches more?

Fan leafs block most of the light so nothing below sees enough of the light of day to do any good.

About 16â?� is average if your plants get too tall just bend them over (if you bend them over the buds get more light and grow bigger). You could crop them to keep them short and bushy you crop between the 4th & 5th node early in the vegetation state for best results.