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View Full Version : First Grow In South Africa.. Help appreciated



doomie62
02-04-2009, 03:29 PM
Well iv have decided to grow some nice indoor Cronic, and i got hold of white rhino seeds off of rhino-seed's.com and i have built a big grow house dimensions are (5 feet tall-3 feet wide) for light im using a 400watt Metal Halide for Veg and a 400watt HPS for Flowering.. for ventilation i have got one main extractor fan that push's cold air into the box, and two very powerful 120mm fans to circulate air. for soil i have gone for basic potting mix the best i could find.. i started the grow on 7 Jan 09, and they have been going strong ever since at the moment the are on day 17, temps are around 72c and humidity is around 70-80.. and help would be great :jointsmile:

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AfricanAlien
02-04-2009, 05:44 PM
Dude that light is way 2 far from the plant. This will make it 2 stretch like hell. Rule of thumb if you put the back of your hand above your plants and it burns then the light is to close. Warm is fine

frostymcfailure
02-04-2009, 06:24 PM
hah that will stretch like hell all the way up their, give it about 2fet-away from tops for a 600w & 3 for a 1000w.
PLEASE DO US ALL A FAVOR & PICK UP SOME OLD TIMER HAZE & GIVE A GREAT OUTDOOR A GO!!! Nothing beats an 16-18 week flowering true equator haze. If you do though be careful & in the words of an infamous cocaine abusing legend who quit years ago, "strap on that diaper sonny! Oldtimer's Haze - International Cannagraphic Magazine Forums (http://icmag.com/ic/showthread.php?t=59801):rastasmoke:

doomie62
02-04-2009, 08:39 PM
Dude that light is way 2 far from the plant. This will make it 2 stretch like hell. Rule of thumb if you put the back of your hand above your plants and it burns then the light is to close. Warm is fine

thanks for the info, i tried looking for something that said how far but was unsuccessful will do that right away

doomie62
02-05-2009, 12:43 PM
one thing the humidity here gets really high 85-95 on a hot day, inside the box its a steady 70 will this any effects on the plants??

pudder
02-05-2009, 05:21 PM
No 70 is fine. it could be a little higher though but to hi not good and to low not good ya know. If you stay between 70 and 80% you will be fine.

AfricanAlien
02-05-2009, 07:50 PM
Just watch the humidity leves during flowering because you don't want mold!!!

Another rule of thumb which most people do is they blow air up toward the light across the plants from the base. They do this to keep the hot air from the HID lamp away from the plants, then the extractor draws the air out @ the top while cold air is push in at the bottom.

Check 2 see if the fans are not blowing hot air down cause this will damage your plants.

doomie62
02-05-2009, 11:22 PM
No 70 is fine. it could be a little higher though but to hi not good and to low not good ya know. If you stay between 70 and 80% you will be fine.

great to know so glad that the humidity is constant 70-75 inside :):D thanx pudder

doomie62
02-05-2009, 11:29 PM
Just watch the humidity leves during flowering because you don't want mold!!!

Another rule of thumb which most people do is they blow air up toward the light across the plants from the base. They do this to keep the hot air from the HID lamp away from the plants, then the extractor draws the air out @ the top while cold air is push in at the bottom.

Check 2 see if the fans are not blowing hot air down cause this will damage your plants.

Will do iv just bought a humidity device/tester:stoned:

The fans are as follows, the main fan on the wall is extracting Hot air, and i have placed vent at the bottom of box to bring in cold air. Then those two 120mm fans circulate air and blow on plants (have felt the air is cold).. :jointsmile:

so from what i have said is the air circulation sorted?

doomie62
02-09-2009, 03:00 PM
well here are the plants at present, day_31 let me know what you think.. and i have put plants 5 inch's closer to the light, were its the coolest place possible.

Rusty Trichome
02-13-2009, 02:33 PM
A 400w light will have an effective range of almost 3 feet. For young clones and seedlings, 2 1/2 feet is fine. Once clones are rooted, or seedlings are well-established...ok to start lowering the lights. (hardens them up to the increasing light intensity) After about a week of hardening them up, I keep my lights within about a foot, until harvest, but your ambient room temps will determine what you can get away with there.

In flower, I would take the fans off the light timer, if it's on the same circuit. With high humidity, you'll want the fans on 24/7. In flower, 70% humidity is not fine. The lower, the better. I live in the desert, and summertime humidity stays around 10%. The ladies love it.
In veg, the plants like humidity a tad higher anyway, but keep an eye open for mold, just the same.

doomie62
02-16-2009, 07:05 AM
A 400w light will have an effective range of almost 3 feet. For young clones and seedlings, 2 1/2 feet is fine. Once clones are rooted, or seedlings are well-established...ok to start lowering the lights. (hardens them up to the increasing light intensity) After about a week of hardening them up, I keep my lights within about a foot, until harvest, but your ambient room temps will determine what you can get away with there.

In flower, I would take the fans off the light timer, if it's on the same circuit. With high humidity, you'll want the fans on 24/7. In flower, 70% humidity is not fine. The lower, the better. I live in the desert, and summertime humidity stays around 10%. The ladies love it.
In veg, the plants like humidity a tad higher anyway, but keep an eye open for mold, just the same.

thanx rusty for the info, im gonna so exactly waht you say about the lights. ever since i moved them up towards the light they have gotten much bigger and thicker on the stems, at the moment i keep the fans on 24/7 do to heat/humidity and these fruit flies that seem to think they can destroy my plants..