Lighting and Ventilation
1,620 topics in this forum
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- 420 Crew
- 19 replies
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Hi, I have a cupboard of these dimensions: 800 X 530 X 1700 with an extra attachment of 750 X 390 X 60. I have installed a 400W HPS lamp with bat-wing reflectors. A 150mm exhaust vent running to a inline Axial Allvent fan with a 150mm X 600mm odur sok attatchment. When I switched on the lamp at first it was 24.6 C and 79% RH. Now after 1 hour and 10 minutes it is 41.5 C and 68% RH. The cupboard is located in the laundry. There is no external ventilation apart from the normal exhaust fan which is directly above where the odor sok is suspended. I am thinking the 400 W is too much. That 41.5 is with both the cupboard doors and the laundry door open with an osc fa…
Last reply by brick, -
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- 3 replies
- 910 views
I'm curious on lighting, alot of people seem to use 18/6 veg 12/12 for flower, I was wondering if there are any advanteges to using say 24/0 for veg and 18/6 for flower. This provides a shorter lights on period than in veg but is it enough to trigger flower of do you need more than 6 hours dark? I was thinking that if you could do that no probs, would the buds grow bigger than on 12/12 as they have 6 hours more light each day or have I got something totally wrong here? Slightly off topic but I read a paper written buy some canadian guy about marijuana potency and in it it states that high UV radiation exposure causes plants to increse trichome production inturn increasin…
Last reply by bloodshot_eyes, -
- 2 replies
- 875 views
Ok guys and girls. I'm just about ready to kick off the next grow, just waiting for the real estate to do their inspection thing, and for some seeds to arrive. I was checking out what ballasts I have just before, and I came up against an old question I've had on my mind for a while but never resolved, and I hope someone here can put me right. I'm going to run one of my 1kwatt lights. But I have two different ballasts, and I wonder which one is better, as in does one draw more power than the other, one more relibale than the other, produce more light than the other..anything measurable between the two which would make one better than the other? Des one run hotter than …
Last reply by RobbieGanjaSeed, -
- 4 replies
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Ok, well I have just finished watching a vid over at YouTube. It was all about UVB and THC and the relationship between the two. Oh, before I forget, here's the link for the vid if anyone is interested. Caution tho, it goes for about 17 minutes. And it got my to thinking how I might try it out on my grow. Apparently UVB is somehow responsible for the production of THC... I have an incandescent UV globe and now I'm planning on adding it to my lighting array when it's time for my babies to flower. Has anyone tried this? Ideas? Feedback? ~Rose.
Last reply by Rose Gardener, -
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i have had 3 plants under a 400 w hps light for about 5 days the plants are about 7 weeks old and there on 12/12 for the last 5 days as well. I cant tell what sex there are yet dose any one now how long that usualy takes after 12/12 to identify? well my main problem is my leaves on my plants are starting to curle up towards the light they look very healthy but its like the leafe just wants to roll up i have my hps 32 cm away from the top of my bigest plant so i dont think it is burnt at all if any one has any advice for me that would be excellent, another question i have is am i flushing my plants right i have them in about 3 gallon pots and flush them with about a gallon…
Last reply by Tom, -
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- 763 views
hi everyone hope you well. now i am in the last step to get the materials to finish my first indoor cab. thanks a lot to everbody that reply my first stupids questions about indoor grow, is really confortable and usefull for me to read post in this forum....i already decided to get seads from nirvana (white widow), due to space i just could make a cab with the next dimensions: 180cm Height X 58cm Wide x 33 cm deep with door, the interior is with reflectant paper i know that is no too big, but i think that i can do something with this. I am thinking in divide by 2 the heigth room so ill be with 2 stations (veg and floration). according with the Lighting & V…
Last reply by cogollo, -
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welli bought a new globe today. i couldnt help my self when i seen 600W HPS globes for $27 on ebay . so just wondering if anyone has used these before and how you went. gnome.
Last reply by garden gnome, -
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So im using a brand new set up. 600w digital ballast, along with pulse start metal halides (sun system) from life light tech. These are supposed to be awesome bulbs. But...im having what i think is a problem, you tell me. There is some sort of "flickering" going on. Its very subtle, but you can tell that the bulbs have some flickering and almost color change from red/blue. With the naked eye, its so bright in there that you cant really tell, but with shades on you can really look at the walls and tell there is a flicker. Now should i be worried about this, or has anyone had this and will it stop? The company said that it could be a cheap ballast, but the ballast is bran…
Last reply by wannado, -
Cool Tubes
by Hobbes- 3 replies
- 827 views
should u be sucking or blowing the air thru?
Last reply by jimbojones5678, -
Computer fan 1 2 3
by eexpee-
- 420 Crew
- 21 replies
- 2.7k views
I have an old computer with a perfectly good fan. But the problem I am facing is how do I adjust the fan so that the power pulg with go into the wall? Or, for those who have done it before, give me some tips on how to give it power? Thanx
Last reply by Al B. Fuct, -
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- 420 Crew
- 6 replies
- 883 views
i have a near new 1000w MH ballast and globe which is too big for my purposes. whould like to swap for 400 or 600W. sydney
Last reply by hano, -
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- 420 Crew
- 4 replies
- 821 views
Any help in choosing which type of fan, where to purchase, approx. cost etc. would be greatly appreciated
Last reply by Luke Skywalker, -
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- 420 Crew
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I have it at 80f/26c since i switched to a 600w lamp. I thought i would get a temp increase and sure enough i did. So is this temp ok, or will it be wise to lower it. Good thing is that the humidity dropped from about 60% to about 40% with the increase in heat. thanks - yota
Last reply by Ozzy420, -
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- 1 reply
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I'm building a grow room in a closet with the dimensions of ( H=4FT W=3FT L=2FT). I'm getting a 400w HPS. What I want to know is how much plants could I fit in this area? and how should I go about ventilation. the area I live in never goes below 70degrees summer time . I live in a high place so the air is always circulating through the main room (knocking over pics etc..). The closet have two swivel doors in front and I have the sightest idea how to vent it, any help will be appreciated....One more thing do I need to vent the area for the veg compartment(I was thinking on using a large rubbermaid green container) ? Thanks for the help
Last reply by liquidkush, -
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- 420 Crew
- 6 replies
- 760 views
Hey guys, setting up a new grow room/wardrobe wanting some advice on air flow. I will have a 400w HPS running inside a fairly standard sized wardrobe which will be located in my laundry. I was going to have a 300mm exhaust fan running from the top with some ducting up to the already established exaust fan in the laundry. This way I can have a timer on the fan that i want to run from the wardrobe and if it gets really hot then i can manually switch on the laundry fan too.. Just wondering peoples thoughts on this one and if anyone knows where a good place to find ducting is (and fans for the matter). Cheers..
Last reply by sinz, -