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consider a thermostat for the fan?

it will depend on how hard it is to get a wire from your breaker box to the garage. subfeed cable will run $1-2 a foot and the rest of the materials under $100 plus timer. you could have a 30 or 50 amp 220 outlet for a welder installed and buy/make a controller to take with you. something like...

for the cost of 2 -3 conversion bulbs, you could buy another ballast. IMO, its not worth the money.

the only leaks that would cause smell in the house would be in the ducting before the fans.any leaks after the fan will blow air into the room. can you move the fans outside of the grow to the very begining of the loop. is the smell around in the room that you get your air from? could you be...

if you have the fans at the start of the ducting to push the air across the lights and out the chimney,your smell is not coming from the lights. any leaks will push air out of the ducting and into the growroom. if your fans are at the chimney and suck air in across the lights,it would also suck...

do you have 2000 watts available in your veg room & 3000 watts in your flower room? if yes the you wont need a cord. if not then you will need cords.if you don't have 5000 watts available on that floor,you will need an electrician to add a dedicated circuit or 2 to give you enough power.

perhaps you should read that report again, no documented evidence? and the above studies are only for increasing CO2 by 100%. in other words,going from about 300 ppm to 600 ppm. increase CO2 by 400% (say 1200ppm) and you could see even better than 100% increases in growth. even at a...

at that temp,it wont grow. in a small box with both lights, the heat they put off may be able to keep the box warm enough. at 10-15 degrees, you could keep a couple plants alive for weeks if needed but you would see very little if any growth. at 15-20 degrees, you will get a little growth but...

N.America or Europe? it matters when it comes to electric you will probably need to add a dedicated line for the flower room at least. map out your breakers. find what breaker controls every outlet and light in the house. you can safely run about 1800 watts from a 20 amp breaker and about 1200...

so how about wood pallets but set them on something to get them off the floor? 1/2 pvc pipe.metal electric conduit(called EMT).a brick at each corner.

hold your hand (palm down) just over the canopy. if the heat on the back of your hand gets uncomfortable after a minute, the light is to close

1/4 inch should be plenty

yes you can ignore the ground. in this case,it doesn't mater but when asking about electric on this forum,it helps to state if you are in N.America or Europe as we use a very different system in America

what are the laws like for growing in Iran? from what our propaganda machine tells us,I would assume stoning could be a penality.

I would be leary of using wood but if you are under 400 watts, it might be ok.I would use some sort of standoff to keep the ballast away from the wood. meybe a nut or a few washers between the board & the base of the ballast & check for heat every few days. A coffee can would be better than...

LOL should have added to leave unplugged. I figured after a drenching, anything that would hold a charge would short out.

is that alum foil on the walls? ditch it & paint the walls flat white or get some mylar. alum foil is only reflects about 70% of light compared to 90% reflectivity for flat white.

you should mount all the parts to a board at the very least or put it in a can. if your mount is metal, ground that and the hood

I use 1 and love it.-dont use it in the growroom,your plants wont have any smell. I vent into a basement room that has the ozone generator & vent that room outside. my basement is damp so I sometimes run it an hr or 2 a day when nothing is growing to control mold.I wouldn't use it in a room/area...

very nice but to warn anyone building this, the outlets are 120 outlets but its wired for 220 - not a problem unless your ballasts are 110 or your wife tries to plug a vacum cleaner into it.