chronicallyDank
Active Member
Pure AK. 5 weeks in
400w Club-Show Off Your 400w Pride And Joy
- Thread starter upinchronic1
- Start date
Illumination
New Member
it does get hot...is it a magnetic coil ballast or an electronic/digital?
The heat is easily addressed with good ventilation though
Namaste'
MasterHemp
Well-Known Member
Hey guys great looking plants!! 
Been awhile since i posted an update here, today i was moving the colas around so they all get equal lighting and so i thought i'd take some snaps while i was at it
White Widow, Sativa dom. Week 9 of flowering
Had a N problem at the start thats the explenation for the curling you see but it has not gotten worse and hasn't really affected the buds
This white widow got out of control, definitely didnt plan on it getting this big lol
but on the otherhand the yield is looking fantastic
Happy Growing
Been awhile since i posted an update here, today i was moving the colas around so they all get equal lighting and so i thought i'd take some snaps while i was at it
White Widow, Sativa dom. Week 9 of flowering
Had a N problem at the start thats the explenation for the curling you see but it has not gotten worse and hasn't really affected the buds
This white widow got out of control, definitely didnt plan on it getting this big lol
but on the otherhand the yield is looking fantastic
Happy Growing
incognegro999
Well-Known Member
37 days into flowering.
Flo Grow
Well-Known Member
Hello fellow 400'ers !
I wanted to post this for those, which is most, that do not know the correct height for light penetration using a 400w HPS
My Hortilux 400w and using the Inverse Square Law in regards to light penetration :
58,000 lumens/sq ft UP TO 1 foot from the light.
14,500 lumens/sq ft UP TO 2 feet from the light.
10,875 lumens/sq ft at 25 inches from the light.
Just ONE MORE INCH, 26 inches, drops my lumens to 7,250 and that would/should be THE absolute max distance.
Because at 27 inches it's now giving 3,625 lumens.
At 27 inches, our 400w is nothing more than a CFL !!!
Hell, my 125w Sunleaves are 10,000 lumens (6400K) and 9,500 lumens (2700K) apiece.
So as you can see, for EVERY inch I move my 58,000 lumens AWAY from my plants, I/we lose 3,625 lumens.
That's serious and makes a big difference knowing or not knowing.
The sun gives approx 10,000 lumens/sq ft
A growers wattage should be at least 50w/sq ft
But if we are not using the lights correctly, wattage don't mean a damn thing.
I go for lumens/sq ft and not wattage.
Hopes this helps !
...
I wanted to post this for those, which is most, that do not know the correct height for light penetration using a 400w HPS
My Hortilux 400w and using the Inverse Square Law in regards to light penetration :
58,000 lumens/sq ft UP TO 1 foot from the light.
14,500 lumens/sq ft UP TO 2 feet from the light.
10,875 lumens/sq ft at 25 inches from the light.
Just ONE MORE INCH, 26 inches, drops my lumens to 7,250 and that would/should be THE absolute max distance.
Because at 27 inches it's now giving 3,625 lumens.
At 27 inches, our 400w is nothing more than a CFL !!!
Hell, my 125w Sunleaves are 10,000 lumens (6400K) and 9,500 lumens (2700K) apiece.
So as you can see, for EVERY inch I move my 58,000 lumens AWAY from my plants, I/we lose 3,625 lumens.
That's serious and makes a big difference knowing or not knowing.
The sun gives approx 10,000 lumens/sq ft
A growers wattage should be at least 50w/sq ft
But if we are not using the lights correctly, wattage don't mean a damn thing.
I go for lumens/sq ft and not wattage.
Hopes this helps !
...
rasputin71
Well-Known Member
Me too. I need to get some electrical work done so I can upgrade my 600hps/400mh to a 600hps/600mh setup. Is that overkill for flowering 6 plants?
It is a digitalit does get hot...is it a magnetic coil ballast or an electronic/digital?
The heat is easily addressed with good ventilation though
Namaste'
Illumination
New Member
cut a hole low on the box and cover it with black cloth to block light but not air....cut a whole at the top of the box and put a fan sucking out of the top hole
Flo Grow
Well-Known Member
Not at all.Me too. I need to get some electrical work done so I can upgrade my 600hps/400mh to a 600hps/600mh setup. Is that overkill for flowering 6 plants?
You're just guaranteed excellent coverage !! lol
lovebud420
Active Member
does that tent support both of those reflectors hanging?
rasputin71
Well-Known Member
Yep, no issues so far. I asked the distributor and he said it should be fine. It has a pretty good criss-cross grid of ceiling supports. The real test will be when I add the 6"x24" phat filter this weekend.
lovebud420
Active Member
looks awesome. i have the same tent, 4x4x6.5 right? how are you keeping it cool? i have just one 400w in there with a 6 inch 400cfm inline blowing out the window and i still get 81 degrees sometimes. i'm pulling air from inside my house, should i be pulling air from outside?
drgreentm
Well-Known Member
whats up guys great looking 400 watt grows thought you all might want to check out my multiple 400w grow room. plants on the left are about 3 1/2 weeks in flower the right side are fresh in the room. strains are white widow and bubba kush. although the right side are all white widow got 4 more going in on the right side tonight.
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rasputin71
Well-Known Member
I have a 435cfm fan and currently dial it down to ~70% with a variable speed controller but will probably have to dial it back up some after I add the carbon filter. It stays around 74 right now with the tent open most of the day. I am pulling from and exhausting to the same room in my basement.
lovebud420
Active Member
ok you keep it open, i was hoping i'd be able to keep it closed up, i've got crazy kittens that eat plants lol. but its getting a little warm with it closed. one thing about this particular tent that i would have changed is to have the front zipper zip down from the top instead of up from the bottom. that way you could unzip it from the top just a quarter of the way or half of the way so heat can escape but still keep pets and pests around the floor out lol. great tent though for sure
rasputin71
Well-Known Member
I haven't kept it closed it all day yet, as I work from home and love to stare at my garden throughout the day. I kept it closed for the first 4 hours of the day, as a test, and it didnt get over 75 with the fan running full speed.
Grow'N'Smoke
Active Member
How is your ventilation set up that it works so efficiently? I can see that you have vented hoods; are you pulling through them? I just can't seem to stay below 82-84 with a 400 watt, air cooled, in a 3'x3' tent. I am using the 400 cfm Hydrofarm Active Air.
- GNS
- GNS