Going from 1000w>600w decrease my yield?

My temps are struggling in this summer heat in the Pacific North West ( 91degrees in my Box ) Lights on @ 10pm Lights off @ 10am

Front to Back=6ft
Side to Side= 3ft
Ceiling Height=7ft

I'm currently running a 6" 400CFM Hydrofarm Inline Fan thats pulling outside air through the ducting through the air cooled hood and venting into the attic. Also a 16" OSC Fan thats mounted to the wall on 24/7

I currently have 7 Plants and I wondering if I switch to my 600w will I notice a loss of final yield come harvest time?


Any feedback is greatly appeciated

ch33b

Pacific Northwest
Massive relative humidity
Venting directly into attic

Expect black mold soon! You need to change your exhaust to go directly outside instead of dumping in your attic.

Your yield will decrease of course, based on space you wouldn't have been able to realize the full potential of a 1,000w lamp anyways. A 600w is more appropriately sized for your grow space and will help you combat your heat issues.

In the future you may want purchase another ballast and two hoods. Two 600w lamps in the space would be lovely if you can ventilate them.

AlecTheGardener said:

Pacific Northwest
Massive relative humidity
Venting directly into attic

Expect black mold soon! You need to change your exhaust to go directly outside instead of dumping in your attic.

Your yield will decrease of course, based on space you wouldn't have been able to realize the full potential of a 1,000w lamp anyways. A 600w is more appropriately sized for your grow space and will help you combat your heat issues.

In the future you may want purchase another ballast and two hoods. Two 600w lamps in the space would be lovely if you can ventilate them.

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um i have no experienced black mold my humidity is around 45-54% during the winter and spring months yes I can use a 1000w my last grow 3 months ago I was able to but now that its heating up during the summer days i wil have go to with 400w or 600w which i have in my closet ... i will swap out right now and see what my temps look like..

thanks

Don't take my word for it, Snaps makes a living consulting for cannabis growing operations in Colorado:

SnapsProvolone said:

Pumping humid air into attics results in black mold growth on the underside of the plywood sheeting. Not smart.

Put in a roof vent

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There are also a few other growers with some time under their belts suggesting the same thing as above in that thread.

Do some reading and decide if you want to invite mold or you want to combat it, your choice.

Good luck.

Snaps?

I have never had black mold in my garden dont see why it would start now my humidity is right around 50% thats not asking for mold but what do i know? i have been doing this a year and never faced mold issues

ch33b said:

I have never had black mold in my garden dont see why it would start now my humidity is right around 50% thats not asking for mold but what do i know? i have been doing this a year and never faced mold issues

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I have done all I can, I have informed you. You will have mold in your attic eventually, when that happens it will be troublesome.

Why not just prevent it?

Bring ducting in and exhaust through a roof or gable vent. Very inexpensive compared to mold removal and abatement.

Good luck.

https://www.rollitup.org/index.php?threads/loft-for-venting-and-electrics.833679/

I molded the shit out of a rental house back in the day by ventilating in the attic. I read some dumbass advice on Rollitup to do it that way. Thats why I sometimes get short with people who post advice and don't know what they are talking about. Live and Learn.

Don't exhaust into an attic.

- Jiji

Well at 91 deg you're going to notice a dip in your yield anyway.

So one way or another you’re going to notice a dip in your yield.

By using the 600 and lower temps assosiated, you will have the possibility of good bud.

The possibility of getting good bud at 91 deg is significantly less.

May I say your exhaust system may be somewhat under powered.

You may want to add an 8" or swap it up for a 10", or something like that.

Also your doing it wrong.

Pull air from your grow room instead of outside and watch your temps drop drastically.

600's are for lamers

- Jiji

Depend on your skills it could give you more weight if the 1000w setup was too hot, if not, you will lost for sure

Buddy use the fittings ect from the 1000 to build a custom cool tube and upgrade inlet and exhaust fans to bring those temps down... There is no substitute for more light 1000 watts is 40% more light than 600watts therefore if everything else is dialled in you will see 40% drop in yield roughly... I would be fixing temp and keeping the 1000 in fact is it was me I'd be running both haha... Light= yield more than any other factor assuming your plants are healthy...

hello i was just wondering if anyone has any advice or experience with the dual light system.

ch33b said:

I have never had black mold in my garden dont see why it would start now my humidity is right around 50% thats not asking for mold but what do i know? i have been doing this a year and never faced mold issues

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The mold would be in your attic, not the grow room.

ms apprentice 101 said:

hello i was just wondering if anyone has any advice or experience with the dual light system.

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I've used two 600w, if that's what you mean.

well my landlord was the one who told me to vent into the attic this is his rental house... I asked if I could go out the side of the house (roof) and he said no so i was forced to vent to attic guys! (which i was suprised he told me i could do) ... at the end of the day when I move out I wont have to deal with the black mold but there are also little holes for air to get into the attic so hopefully theres no black mold up there .. here is pic of how i have my setup to give you a better idea

the first pic is where the ducting pulls fresh air in and then blown through the air cooled hood..

the second pic is where it comes out the side of my box and goes up into the attic

the third pic shows the little foam hole support for the ducting ( the 6" inline 400cfm fan is to the right of the ducting ) and the ducting connects to the XXL magnum air cooled hood.

the forth pic shows the inside of my little 6x3x6 box you can see the XXL magnum hood. the ducting goes through the hood and runs out the left side of the foam wall up high and up into the attic.

ch33b

dang, nobody has any feedback from the setup i took time to explain?

I can't view thumbnail photos on this site unless people put them in as full images for some reason been trying to sort it out for a while...

I suggest putting another fan on the end of the inlet ducting the other fan near the hood may be struggling to pull air down the ducting depending on how long the ducting is like I said I can't view the photos to look... Also where are you pulling air from outside?

How many cfm is your exhaust fan? Have you got any fans in the grow space to move air around?

You should be able to keep temperatures down in that little grow space, at one stage I was running a special little tent not much bigger for personal strains with 1200watts and managed to keep it cool with just fans...

Sorry buddy just re read your initial post, you need another exhaust fan for the general space not just the vented hood, probably running into a carbon filter unless your not worried about the smell. Get a big cfm fan don't buy it from a hydro store they are rip-offs just a general fan store you probably already knew that... This should reduce temps by a decent amount....