Question about shutting off lights during flowering.

Right, now onto the heat/lighting problem.
I didn't manage to find your room dimensions but an educated guess tells me you have around 4 square metres (please correct me if I'm wrong, it would help).

1) In a room as small as you have the parabolics are pretty much useless, they should be used to light a much larger area than regular reflectors can from the same (if not higher) mounting point. A 600w HPS is perfect for lighting 1m square from a height of 6 feet so to light that room ideally it would need 4 600w bulbs with regular (dutch barn/Ajustawing type) reflectors. The parabolics come into play when trying to light for example a 4m square space with a 600w or even a 1000w HPS from the same 6 foot mounting point, giving better light distribution. Commercial growers with the same 4 parabolics and 4 1000w bulbs would light a space from around 8 square metres up to 16 square metres.

2) I would suggest removing the CFL's alltogether (in a room that size with that much light they are actually pointless and are adding to the heat problem) and remove one of your 1000w bulbs, preferably a MH as they run hotter than a HPS anyway and the resin difference between the two is actually negligible. The HPS will give you the solid weight and then it's the physics behind the mass/surface area of bud that comes into play. Then hang (if you have three) three 1000w HPS bulbs bare (no reflectors) spread out in a triangle shape (like you did have), the reflectors are not needed in a room that small (forget about what your eyes see) and this will also greatly improve your air flow.



Sorry about the dodgy sketch but I don't have photo shop!

My last run for personal smoke I had 4 plants per metre squared in 9 litre pots of coco under a 400w.

View attachment 2036291

They pulled around 3.5 - 4 oz (dryed and cured) each and finished around 4 feet tall (from the top of the pot).
More isn't always better, a plant can genetically only produce so much bud for it's size no matter how much light you put it under.
Your plants are nowhere near big enough to use all that light your trying to throw at them resulting in most of it being wasted, heating up your room and it costing you far more in electricity than is actually necessary.
You have a lot of wasted space in your room, if you can see the floor you're not utilising your space/light efficiently. With the penetration of those 1000w bulbs you're using there's no need to train your plants, trained plants are used when trying to get more bud from less light. You should have fewer plants and grow trees to maximise your yield.

If growers shoot for 1g of dry bud per watt of light used then your 4000w should be yielding just short of 143 oz, divided by your 17 plants that's a yield of around 8.4 oz of dry bud per plant. That's simply impossible given the size of your plants and shows just how much light is being wasted, in fact to yield that kind of weight they would have to be around 5-6 feet tall and a good 3-4 feet wide and simply wouldn't fit in your room given the temp/RH/air flow needed to keep them healthy.

I hope I have managed to help in some way and happy growing!

Much appreciated man, really. Thanks for taking the time to type all that up. I am slowly setting my room up over the last few weeks, hence why I am running into problems like I am. I aim to have 40-60 plants in there growing straight up, just didnt work out this run, due to clones, time and money. I will for sure fix the whole positive pressure in my room, I switched my big fan to the intake per what someone msg'd me. Figured I would give it a run and try what they said. It has been a lot of trial and error so far. I want to upgrade to 4 air cooled hoods, I realize the parabolics arent techincally the best, but it is all I could afford. Money is tight right now so. I have moved the cfl's out a week or two ago for the veg room, I still need to move my ballasts out of the room, and after that, I may dim the lights. These plants are smaller than I wanted them to be in flowering, but I flowered them early to finish this crop. I want to change the strains around, change my setup a bit, change pot size and a few other aspects.

No idea why this text went italics, I cant fix it.

For now I will dim the lights back to 600w, until I can afford an AC.

LSDreamer said:

Much appreciated man, really. Thanks for taking the time to type all that up. I am slowly setting my room up over the last few weeks, hence why I am running into problems like I am. I aim to have 40-60 plants in there growing straight up, just didnt work out this run, due to clones, time and money. I will for sure fix the whole positive pressure in my room, I switched my big fan to the intake per what someone msg'd me. Figured I would give it a run and try what they said. It has been a lot of trial and error so far. I want to upgrade to 4 air cooled hoods, I realize the parabolics arent techincally the best, but it is all I could afford. Money is tight right now so. I have moved the cfl's out a week or two ago for the veg room, I still need to move my ballasts out of the room, and after that, I may dim the lights. These plants are smaller than I wanted them to be in flowering, but I flowered them early to finish this crop. I want to change the strains around, change my setup a bit, change pot size and a few other aspects.

No idea why this text went italics, I cant fix it.

For now I will dim the lights back to 600w, until I can afford an AC.

Click to expand...

No worrys.

Just have the lights on timers leave the filter and exaust fan and ossalting fans on 24/7 this should sort the temps out.....tyke