Help me set up...please guys :(

[tripleblack]

I have a little shed outside measuring 4'x4' and 6'high. I plan on using a 400w ballast which can take both halide and sodium. I will properly insulate and lightproof first.

I am just unsure on ventilation. I am presuming that because i am outside i will experience less heat (i'm in the UK!) but am aware that i will still need some fresh air passing through. I guess i am just unsure on how much heat a 400w sodium bulb produces and am really confused on fans and filters etc.

Can i get a fan which both exracts the air inside and intakes fresh air from outside????

Basically can someone advise me on what ventilation set up would be required on a room this size, bearing in mind it is an indoor setup outside (if you catch my drift)

Any help greatly appreciated, i have done my research but can't seem to find the answers :(

Cheers,

TB :smokin:

[907PokeSmot]

a 400w in that wont create to much heat. a 265cfm fan would do fine imo for exhaust. then have a passive intake with a filter on it since its outside. biggest concern about it tho would be how cold it will get in your dark period. you might need a little space heater in their when its night.. and if its a metal it will heat up realy hot in the sun.

[tripleblack]

Hey thanks 907PokeSmot. I called it a shed but it's actually made of brick, i figure if i insulate it enough it should be ok and retain the heat during the dark period, although the idea with a little heater is a good one.

What do you think of making the dark period in the daytime so the lights are on in the night when its cooler?

Do you think i will need some detection foil stuff to hide the heat or if i insulate it well enough the heat shouldn't show?

Can someone post some pics of what i need (passive intake with filter and a 265cfm fan)

Sorry for all the questions, quite excited about my little growroom :)

Peace

TB

[harris7]

a passive intake is a hole.

a 265 cfm fan is just a normal fan that moves 265 cubic feet per min.
no pics needed man

it is hard to say if you'll need to have your lights on at night
you wont need it if you have a proper fan.

and a small heater with a thermostat isn't much money. it'll keep it warm if the temp drops

I have never heard of a ballast that can take both kinds. are you sure you arn't getting a HPS ballast and a conversion bulb?

[907PokeSmot]

yea their are switchable ballast that can use both.

that night/on day/off thing works great if your schedule can do it. only thing then would be to make sure their is no light leaks. it will be more evident at night. but i would say get your light and turn it on for 12 hours then check the heat in their. if its pretty good. then great don't need exhaust.


but intake you still do need to keep fresh O2 in da room. unless "this option is awesome if your heat stays down" is to use some Co2 in your grow room. will do alot for your plant its whole growth.

http://cheaphydroponics.com/cart/index.php?act=viewCat&catId=40

thats a link to some squirrel cage duct fans. i like squirrel cage the best since they are a little cheaper then the in line fans. but dats me = )

but like i sed earlier if you don't get much heat in their. think about a co2 system. its about the same as a good fan minus the gas.