Switching from flouros to 1000w HPS

I currently have two flowering girls at one month in flowering. I have been using 6 - 2' Flouros and some CFL side lighting, they are doing very well but i know the 1000w would fatten and densen up the buds drastically. I was curious to if i switched to the 1000W HPS if it would be too much stress to the plants? Also how high would i need the light from the tops? Thanks!

thats overkill but you can get about 12-18 inches with good heat control. i tend to stay 18- 24 inches away

Technically it is "overkill" But i look at it this way, if it wont effect the plants as far as burning and too much heat, i should multiply the yield tremendously. My only problem is that i have no glass for my hood or aircooling yet. Does anyone know approx what that will run me?

i have 2 600w hps's and they get hot dude. i have the air cooled though and this seems to help quite a bit. make sure you air cool your reflector and exhaust the hot air out of the grow area.

i use a 1000w of light so i'll add my two (or maybe three) cents...
1) pretty hard to achieve overkill when it comes to lighting. chances are the temps will get too hot before you achieve "too much light".
2) i'll mention heat again since that will most likely be an issue
3) i switched to low-power lights to 1000w and when i did i thought my plants were toast! more than 80% of the leaves were either burned and crispy or bleached. They bounced back within a few days and were hardier and bushier than ever. Moral of the story - weed is very resilient but don't put a 1000w of light too close! i'd start with air-cooled lights about 18-24" away and watch your plants carefully.

no, i know i must aircool them, i had the same issue on my last grow that wasnt a grow at all after i added the 1000W with no aircooling, only only 2 plants out of 8 didnt die from being fried, and i put them into oudoors after. This time i want to aircool it, i have about 3' of room above the plants to play with

the aircooling system I got at my hydro store was $20. That would be the glass and the fittings on the side for tubes. I also bought it at the same time as the hood so I knew it would fit. If you don't buy from the same store you got the hood, measure it to make sure you get the right size glass.

yea the hydro store by me said 20$ for the glass, i was curious to how much i would need to spend to properly air the hood? what size fan would be sufficient?

I think my fan is 170 CFM for the grow and around 440 CFM for the exhaust (or at least close)

so you would reccommend 400 CFM and above for just the light?

no - the 170, i use for the light and the 400+ for exhausting the room.

Well i have two pretty good PC fans running, one inlet one exhaust, there pretty powerful, you dont think if i had a fan on the light with one inlet open taking air from the grow area, going through the light and out?

PiffGuerilla said:

Well i have two pretty good PC fans running, one inlet one exhaust, there pretty powerful, you dont think if i had a fan on the light with one inlet open taking air from the grow area, going through the light and out?

Click to expand...

you won't really know until you try it. personally, i doubt a PC fan is up to the job of cooling a 1000w light. A 170 CFM fan barely does the job - especially if you are in a warm climate (or it is summer). You may want to consider getting a 400 or 600w light and get the proper fans. Fresh air contains CO2 which is key for plant development.

i was really fucked up typing yesterday. What i MEANT to say is i have two PC fans for the grow room itself, one inlet, one exhaust, as well an oscillating fan for a nice breeze . With the 6 - 2' Tubes, one 150W CFL, and two 55 Watt CFLS as well a 2 1/2' UV tube. With all of that and shit aircooling i have for the room the high temps around 75-78MAX. If i get rid of all the lighting and checked the temps it would prob be pretty cold in there, its a concrete floor in the winter so it does stay somewhat cool. I figure if i get all of the clutter out of the area, and i mean clutter, that would help bring more volume to the room for cooling, i would have so much more room to work with as well. Since i know i MUST aircool the hood and glass it, i dont really care which fan i must get as the price shouldnt be drastic and i only need one fan, will this be enough?

ALSO what would work better:

-Ducting air from an outside source (winter so temps are nice and low around 37 degrees avg i would say )which is very nearby going through the inlet of the hood and then out the other end and ducted out of the grow area, but have no other source besides the PC fans bringing new air in and out of the grow room.

-Ducting air from the grow room from the inlet of the hood, and sucking the air through the hood with whatever fan and exiting the air out of the room and then route both PC fans as inlets

Which would be more effective?

it sounds like you may have to worry about too cool of temperatures during the dark periods after starting 12/12. If you do find things getting too chilly, you should get your plants off the cement floor (put them on styrofoam or something insulating like that.

Passing the cool air past you lights and exhausting out the grow room is how i do it. with the right exhaust fan, inlet fans are not necessary - you just need a few passive intake holes.

oh nice, and if i exhaust the air out the room i will have some backpressure fom the suction where i can just remove where the pc fans are and just make that the passive intake hole. Also email, since im using the auto-pot system i put that on top of a wood block which is sitting on top of a rubbermaid storage shelfing unit in between the top shelf where the flouro lights are. Now that you say this, do you think i should shut off the oscillating fan and the inlet/exhuast PC fans? do you think the temps may get too low at night? I have slight purpling on some leaf stems but nothing major, i dont think they are temp stressed right now, do you? ill get a pic of the buds in a few mins

I think it would be worth having a thermometer in there to know for sure. After you know for certain, then you can begin taking steps to correct things. I think it is a lot easier to increase reservoir temps than it is to decrease them.

Your buds are looking good.

thanks man, i have had a thermometer in there, i just havent checked the temps at night because i didnt want to disturb the photoperiod. Do you think this is good growth so far for 35 days into flowering? How long on average in days do you think haze flowers in?

I think the look fine - here's mine on the 29th day of flowering...
https://www.rollitup.org/grow-journals/40539-email468-new-equipment-grow-ppp-4.html#post436922