What size room can a 400 watt mh/hps sufficiently light?
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KP419 said:
It looks like typical 400W MH bulbs put out between 33,000-36,000 lumens. So if we go with 36,000 you could use it for up to 12 sqr feet of veg space. If you wanted to flower with it for some reason it would be good for 7 sqr feet.
powerplanter
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3x2 or 3x3 give or take.
KP419
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My new room is 4x7x6...(4ft wide 7ft in length and 6ft tall) what is the square ft of this room and what size light would i need to run? I know I am going to have to partition a part of this room off since I only have a 400 watt at the moment.
BackWoodsDrifter
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Not much good at the calculatin either pilgrem but I can answer like this here ifin it helps. I can grow 3-4 plants quite nicely under my 400w mh but then gain I have a couple 150w hps in the mix as well. Good luck yur travels pilgrem hopes they end well with yur pouch full 
BWD
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KP419
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do you think if a minimize the room to 4x4 will my 400 watt do ok? I am going to do my first scrog grow this time. I always have issues with one or two plants growing much taller and faster than the others and constantly having to either move the light or the plants so going to give scrog a try as I have seen others have great success using this method. How close can I keep my light from my plants without damage? I have an exhaust fan on top on my ballast to remove the heat the lights gives off.
T
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KP419 said:
No. To get the area of a room, all you need to do it to multiply the length and the width--very basic math. A 4 x 4 is 16 sq ft and a 400W light will not cover that much. You are going to want your space 9 or 10 sq ft, depending on the lumens from your bulb. A 9 sq ft space is 3 x 3.
What do you mean when you say you have an exhaust fan on top of your ballast? Can you explain your ventilation system? What type and size of fan you are using?
KP419
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I was adding the info on exhaust because of the heat in such a small room. There is a vent on the very top of my light with a 15ft exhaust hose ran into my crawl space and I just have a basic square bathroom exhaust fan at the moment that fits perfectly over the vent and works great, room is never to hot. I am going to be getting a new light after this grow because obviously a 400 watt doesn't do much. Thanks for explaining the sq ft. thing, i feel dumb now knowing how easy that was, simple mathematics. How many sq ft can a 600 and a 1000 watt light each cover? I want to upgrade to a bigger light.
pcduck
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600 watt bulb lumens divided by 5000 lumens equals the square footage a 600 watt bulb will cover. EX: 95,000 lumens divided by 5000 equals 19 square feet is what a 95,000 lumens 600 watt bulb will cover.
1000 watt bulb lumens divided by 5000 lumens equals the square footage a 1000 watt bulb will cover. EX: 155,000 lumens divided by 5000 equals 31 square feet is what a 155,000 lumens 1000 watt bulb will cover.
I used DigiLux Bulbs for these examples
OldDaddyFedder
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KP419 said:
Also, you have 168 cubic feet of space, so you will need 150-200 cfm fan for ventilation.
Thought I'd throw that in.
:48:
ODF
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