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View Full Version : 400w "mh"~veg "hps"~flower lighting height



420atsk
01-31-2011, 03:21 AM
Im running 1 400w mh-for veg & hps for flower in a 4' x 4' x 7' tent that i made for cheap but its great how high could i run my light?
I had been told 15"~24" ive had it about 12" its doing great but if i was to raise it up to prob to 20" im not 100% just raised it up all the cola's get more direct/reflected light but is the lumen still good enough to produce dense bud's i have 3 main plants 2 bigger ones 1 that was from a seed. "ive been fine haven't had a prob yet from a seed for the people that wont touch a seed" anyways it is getting a little to big to have it at 12" and reach everything it should.:pimp:

420atsk
01-31-2011, 05:25 AM
here are a few shots after i shaved them a lil

greg1317
01-31-2011, 08:56 AM
I have found that its best to keep the light about 24in above the plant in the first week (when the plants are about 2in high or the first week you transplant clones) Then 12-14in above your plants during the rest of veg with the top of your tallest plant being 12in away. You want to try to keep your canopy as even as possible hopefully with just a few inches difference in your plants. During flower I usually like to put the light at around 10in and let it grow to 9in then move it again. It also depends on if your light is air cooled and what the temperature of your canopy is when you have your light that close. If you had a digital thermometer with a probe hanging over the canopy you could see what the temperature is right above the canopy when you have your light at a given distance. You want to keep the light as close as possible without burning the plants or causing them to wilt from heat. Its optimal to have you canopy remain at around 72-75*F but it can vary from there. I wouldn't recommend temps below 60* or above 90*. If you can keep your temps in the 70s at all times that is optimal especially during flower. Night temps can be 10* lower than day temps without any problems. However, my friend has grown during the summer here in CA when its over 100*F during the day and his box got to 100* sometimes. Even with those conditions his buds still turned out dank. So its definitely possible to grow dank buds in less than perfect conditions. Hope that helps.

greg1317
01-31-2011, 09:23 AM
I wasn't really clear about this before so I thought I should say it. You want to keep the light as close as possible but you also want to keep the light far enough away that the plants get a good spread. Thats why i recommended the heights that I did because they give you that spread you need while keeping your light close.

420atsk
01-31-2011, 05:15 PM
ok thanks i have an open reflector and my temps never go under 65 and not over 85ish i think is what ive seen it at i ha vent had a prob with the plants burning its just other cola's are not lit up but im thinking if they grew that way back there they shouldn't hurt any production on the top cola's im kinda done moving and cutting because i should be flowering soon but when i flower keep the light as close as possible and DONT trim for the cola's to get light after i have click to 12/12 right

Dutch Pimp
01-31-2011, 06:21 PM
ok thanks i have an open reflector and my temps never go under 65 and not over 85ish i think is what ive seen it at i ha vent had a prob with the plants burning its just other cola's are not lit up but im thinking if they grew that way back there they shouldn't hurt any production on the top cola's im kinda done moving and cutting because i should be flowering soon but when i flower keep the light as close as possible and DONT trim for the cola's to get light after i have click to 12/12 right
vegging with MH is best...but, too far away is better than too close.
UV rays are strong with MH light. If you want to know how strong?...stick your hand under it for 5 minutes...
... & wait for the pain in two days....just kidding...don't do that!

If you burn the tops...it takes a long time to recover & not all reflectors are created equal.

420atsk
02-01-2011, 05:47 PM
i just raised it to about 15in above the top of my smaller plant it been doing good i also cut a bunch of growth that would have nugged because that book said to so im trying it and it is reflecting more to the back just look's naked and so you know i didnt cut it all out i did about 2/3 more towards the main stem and up each branching off point a lil

I also just went 12/12 to flower so i will update on that Now im going to leave my MH for what 2 weeks and then switch to my HPS or what have some people dont thats works and if you have pics or videos that would help alot more Thanks 420:rastasmoke:

khyberkitsune
02-01-2011, 10:08 PM
I'd personally stick with the MH all the way through. That's just me, though.

greg1317
02-01-2011, 10:28 PM
I'd personally stick with the MH all the way through. That's just me, though.

In my opinion that's a really bad idea. Mh doesn't give off the proper spectrum of light that the plant needs in flower. When flowering the plants need more of a red spectrum and mh provides a more blue spectrum of light. Mh is great for veg and keeps your internodal length short. I would use the mh for the first two weeks of flower then switch to an hps. That is the way all the pro growers do it and I would recommend that way myself. It is possible to veg with hps and I've done it but I wouldn't flower with mh.

Dutch Pimp
02-02-2011, 02:25 AM
I'd personally stick with the MH all the way through. That's just me, though.
I have started weaning myself from HPS lighting.
I only used it during flowering weeks #5 though #8. and I was disappointed in bud growth...but, going back to full CMH lighting will help save some yield & quality....currently at 9+ weeks.

Switching back to (C)MH full time, next grow...:thumbsup:

420atsk
02-02-2011, 02:32 AM
whats a cmh ???

Dutch Pimp
02-02-2011, 02:42 AM
whats a cmh ???
Ceramic Metal Halide: it's a conversion bulb; used on magnetic HPS ballasts. Available in 250 & 400 watt sizes....only.

works great in closets...:)

khyberkitsune
02-02-2011, 03:10 AM
"Mh doesn't give off the proper spectrum of light that the plant needs in flower."

That's a huge misconception. In fact, MH puts out MORE red and blue which are the critical components for flowering. HPS puts out more green. HPS was designed as human lighting, not plant lighting. This is why you're seeing HPS bulbs with 'EXTRA BLUE' - they're lacking what the MH isn't.

"When flowering the plants need more of a red spectrum"

Proven totally false in my blue-dominant flowering experiment. Please see the link in my sig. As an added note, it appears that any higher of a photon flux density per wavelength might be a waste. I still have to sort that out but my blue-dominant results still stand out. I've also successfully flowered multiple basil and cacti types under blue-dominant lights (most recent being Euphorbia obesa.)

"That is the way all the pro growers do it "

Funny you mention that, as every commercial and truly professional food production place I've ever come across (that's to say, in my travels around the world, Holland, Morocco, UK, Australia,) will tell you HPS is a piece of garbage. Those are pro growers. They've got the degrees, they've got the testing equipment, they have the decades of experience keeping people fed.

People choose HPS because it's cheaper than a CMH or MH bulb.

MH is the actual professional standard. And that's going to be that way for quite some time, until other lighting solutions finally start pushing the PPFD of an HID.

Hey Dutch - I just finished making my CMH killer. Maybe I can get you to test it out sometime.

greg1317
02-02-2011, 08:42 PM
"Mh doesn't give off the proper spectrum of light that the plant needs in flower."

That's a huge misconception. In fact, MH puts out MORE red and blue which are the critical components for flowering. HPS puts out more green. HPS was designed as human lighting, not plant lighting. This is why you're seeing HPS bulbs with 'EXTRA BLUE' - they're lacking what the MH isn't.

"When flowering the plants need more of a red spectrum"

Proven totally false in my blue-dominant flowering experiment. Please see the link in my sig. As an added note, it appears that any higher of a photon flux density per wavelength might be a waste. I still have to sort that out but my blue-dominant results still stand out. I've also successfully flowered multiple basil and cacti types under blue-dominant lights (most recent being Euphorbia obesa.)

"That is the way all the pro growers do it "

Funny you mention that, as every commercial and truly professional food production place I've ever come across (that's to say, in my travels around the world, Holland, Morocco, UK, Australia,) will tell you HPS is a piece of garbage. Those are pro growers. They've got the degrees, they've got the testing equipment, they have the decades of experience keeping people fed.

People choose HPS because it's cheaper than a CMH or MH bulb.

MH is the actual professional standard. And that's going to be that way for quite some time, until other lighting solutions finally start pushing the PPFD of an HID.

Hey Dutch - I just finished making my CMH killer. Maybe I can get you to test it out sometime.


lol yea cause you yielded so much from your pathetic little plants. Those things are tiny how can you even act like thats some sort of successful crop. How much did you get like a half o per plant. LOL

420atsk
02-02-2011, 09:10 PM
so its best to stick with what the hps.
cuz thats what my plan's where but if my MH will yield more then i could stick with it the whole way. Ive never heard of using MH the whole time my uncle says why not if it will flower but i know the diff spectrum is better for the flowering stage's compared to the vegging SO..


Again what is the best way people flower for large yields?

Is having the light closer better then a lil further just enough to reach all cola's?

And what is the best way to trim fan leafs for more lighting?

And when/what can you trim after you switch to 12/12?

and if you can post a pic or video of your grow

thanks it will help alot of people:rastasmoke:

khyberkitsune
02-02-2011, 09:19 PM
lol yea cause you yielded so much from your pathetic little plants. Those things are tiny how can you even act like thats some sort of successful crop. How much did you get like a half o per plant. LOL

Why, yes, half o per plant. With each light using 12w LED, that comes out to over one gram per watt.

What are YOU yielding right now? Bet it wasn't a gram per watt!

Oh, and sending me an IM saying this exact same thing and then signing off is a sign of cowardice - just to let you know.

greg1317
02-02-2011, 09:28 PM
I almost made that mark. Last harvest i got 13 1/2 oz with a 400 watt HPS light. I was growing in a 33inx33inx72in space and had 15 plants. It was a SOG grow.

khyberkitsune
02-02-2011, 09:48 PM
You ran off again, coward.

Can't wait thirty seconds for someone to take a pic and upload it?

I'll just post the contract here since you can't stay online long enough to face the fact you got owned with proof, son.

Names redacted to protect those not involved - my name's firmly there, though, for you to pay with all you want.

MULTIPLE COUNTRIES use my expertise, sir.

Don't be mad because you're not my age with my experience. Take it as an opportunity to learn from me, instead.

420atsk
02-03-2011, 04:27 AM
it doesnt matter how you grow it its all the same shit in the long run everyone wants a large yield so what everyone is looking for 1/2oz nug's not a bunch off bullshit shake now SCROG'ing do you have to train the plant from a baby or can i take a 24in plant and bend it around and should you top a plant before going SCROG and whats the best screen to use that a 400w wont burn/melt at 12in away. :stoned:

greg1317
02-03-2011, 10:13 PM
lol you sent me a picture of a scrog grow that wasnt even yours. Your opinion is worthless to me and i will ignore anything further you have to say. Now i know your name and address. If Alex McQuown is actually your name.

khyberkitsune
02-03-2011, 10:26 PM
lol you sent me a picture of a scrog grow that wasnt even yours. Your opinion is worthless to me and i will ignore anything further you have to say. Now i know your name and address. If Alex McQuown is actually your name.

Just for Mod's info - AIM conversation

(2:23:26 PM) AllinThreeHigh: your last name is very rare
(2:23:31 PM) AllinThreeHigh: makes it alot easier to find u

Then he logs off.

I would be VERY wary of this person He can't wait for any proof and he sends messages and logs off like a coward.

BE VERY WARY OF THIS PERSON, PEOPLE OF CANCOM. He's not above harassing you over things he can't possibly understand.

420atsk
02-04-2011, 05:22 PM
wow some people now a days

Anyways this is day 4 in flowering~12/12 i decided to bend the shit out of one of my seedlings basically like i would be SCROG'ing it but im just going to brace and support it i don't have time or space to set up a small screen above just for the one i did it last night and everything on it has turned back upright and all i mean all the cola's are growing mad and even " Now I don't have to rotate it as much for light" other then that i have had my light really close like 10in sometimes mainly cuz its been cold as hell lately.

which lead's me to ask what is the best and cheapest way to keep the tent warm when the light is off ?
(this tent is in a garage with no heat, little ventilation for if it was to get to hot, and a cold cement floor)

So far all i can think is double line the panda plastic and/or raise the pot's higher off the floor mind you it needs to be cheap in case i have to rip it down :stoned:

greg1317
02-04-2011, 06:51 PM
....

420atsk
02-04-2011, 07:03 PM
wow again one guy starts shit SO we are ALL ASSHOLES that know everything

ive only asked ?'s on here one guy goes LED or what ever that bullshit is YES BULLSHIT everything ive seen for most all growers HID is the way to go maybe CFL for veg

SO STOP THE FUCKING CHILD'S PLAY EVERYONE DOES WHATEVER THEY WANT AS LONG AS YOU GET HERB TO BREAK EVEN IS ALL THAT MATTERS TO EVERYONE:mad:!!!

420atsk
02-04-2011, 07:08 PM
Im not trying to be a dick but i dont want that shit on my thread

you know THANK YOU for what you have said it has helped and i think it is starting to flower 4th day today 2/4/11:rastasmoke:

greg1317
02-04-2011, 08:09 PM
i deleted that post before i couldnt update it anymore so if you check again only a ..... is showing now. khyberkitsune is a liar and doesnt know what hes talking about. He sent me a picture of a SCROG grow that wasnt even his and claimed it to be his. I know this cause the picture he sent me is the first pic you see when you look up scrog on google.


Here is the picture from google he claimed to be his.
Google Image Result for http://ourweed.com/wp-content/uploads/2010/09/Grow_room_marijuana_scrog.jpg (http://www.google.com/imgres?imgurl=http://ourweed.com/wp-content/uploads/2010/09/Grow_room_marijuana_scrog.jpg&imgrefurl=http://ourweed.com/perfect-screen-of-green-scrog-grow/&usg=__g4BLP8J5R1vAcmu0lY_Gtd8S2E0=&h=768&w=1024&sz=347&hl=en&start=0&sig2=n0-4O-ZiraUfk6Bcm7WYcA&zoom=1&tbnid=y1GLzWsDYfRLaM:&tbnh=133&tbnw=181&ei=f1tMTYzAEI24sAPrlfGeCg&prev=/images%3Fq%3Dscrog%26um%3D1%26hl%3Den%26sa%3DN%26b iw%3D1280%26bih%3D737%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=129&vpy=114&dur=2307&hovh=194&hovw=259&tx=139&ty=88&oei=f1tMTYzAEI24sAPrlfGeCg&esq=1&page=1&ndsp=24&ved=1t:429,r:0,s:0)

and here you can see it in the image directory.

scrog - Google Search (http://www.google.com/images?q=scrog&um=1&ie=UTF-8&source=og&sa=N&hl=en&tab=wi&biw=1280&bih=737)


Another thing is he claims to work for a firm that sells lighting around the world but if you look at his myspace you can clearly see that hes a 28 year old slacker guitarist.

Khyber Kitsune (Khyber Kitsune) on Myspace (http://www.myspace.com/khyberkitsune)


I'm tired of people on here acting like they are something they are not. I've been growing for years and have learned from experience. I hate when kids like this guy act like they know everything when they clearly do not.

420atsk
02-05-2011, 03:31 AM
HA HA HA HA really i saw that shit looking it up before hand wow some people now a days anyways my plants have been doing great i have moved the light closer and it looks like its starting to preflower im thinking of changing the bulb to HPS on the 7th that will be 7days after going 12/12 with the MH still should i run it longer im starting to think there is to many leaf's growing in it im hoping the stretch will expand it out more I HOPE:rastasmoke:

greg1317
02-05-2011, 05:12 AM
I would keep the MH for the first two weeks instead of just one. The most stretching occurs within the first two weeks and MH helps keep the plants from stretching. at least thats my experience. My plants that i'm growing right now grew from 18in to 36in in two weeks. I'm about half way through my third week at this point and they are about 38in tall. They are starting to slow down now and will probably stop growing height wise around the end of the 4th week. Stretching will help your canopy spread out so dont worry about that. You definitely don't want to start trimming off fan leaves because the plant uses those for photosynthesis. Lower canopy penetration is a problem you always have with multiple plants under a low wattage light in a small area.

420atsk
02-06-2011, 01:42 AM
see i need it to stretch or something because its getting to bushy with tons of smaller cola's and the pistels are starting to come in great but i need the branching cola's (not the main the other large ones) to stretch out so it will all be able to have space for nug growth i keep thinking the HPS will help slow the plant/leaf growth and make it stretch out more that way i can tie it off and not have to rotate it so much :rasta:

420atsk
02-06-2011, 03:39 AM
has anyone dealt with mildew mold or powder mold (WHITE SHIT ON MY FAN LEAF) is peroxide and high PH water the best way to wipe of the plant

its 3% peroxide to 97% water (pref high PH) wipe down no more then once every 4 days better then baking soda

can someone explain how i mix the baking soda

:stoned:

Lynhal
02-06-2011, 08:09 AM
i deleted that post before i couldnt update it anymore so if you check again only a ..... is showing now. khyberkitsune is a liar and doesnt know what hes talking about. He sent me a picture of a SCROG grow that wasnt even his and claimed it to be his. I know this cause the picture he sent me is the first pic you see when you look up scrog on google.


Here is the picture from google he claimed to be his.
Google Image Result for http://ourweed.com/wp-content/uploads/2010/09/Grow_room_marijuana_scrog.jpg (http://www.google.com/imgres?imgurl=http://ourweed.com/wp-content/uploads/2010/09/Grow_room_marijuana_scrog.jpg&imgrefurl=http://ourweed.com/perfect-screen-of-green-scrog-grow/&usg=__g4BLP8J5R1vAcmu0lY_Gtd8S2E0=&h=768&w=1024&sz=347&hl=en&start=0&sig2=n0-4O-ZiraUfk6Bcm7WYcA&zoom=1&tbnid=y1GLzWsDYfRLaM:&tbnh=133&tbnw=181&ei=f1tMTYzAEI24sAPrlfGeCg&prev=/images%3Fq%3Dscrog%26um%3D1%26hl%3Den%26sa%3DN%26b iw%3D1280%26bih%3D737%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=129&vpy=114&dur=2307&hovh=194&hovw=259&tx=139&ty=88&oei=f1tMTYzAEI24sAPrlfGeCg&esq=1&page=1&ndsp=24&ved=1t:429,r:0,s:0)

and here you can see it in the image directory.

scrog - Google Search (http://www.google.com/images?q=scrog&um=1&ie=UTF-8&source=og&sa=N&hl=en&tab=wi&biw=1280&bih=737)


Another thing is he claims to work for a firm that sells lighting around the world but if you look at his myspace you can clearly see that hes a 28 year old slacker guitarist.

Khyber Kitsune (Khyber Kitsune) on Myspace (http://www.myspace.com/khyberkitsune)


I'm tired of people on here acting like they are something they are not. I've been growing for years and have learned from experience. I hate when kids like this guy act like they know everything when they clearly do not.

I was looking in on this thread and thought this was interesting, so I read it. The MS page you posted is also interesting. Someone living with their fiance, yet listed as a married bisexual. Not sure how that works, but to each his or her own.

To the OP of this thread, I hope all works out for you with your grow. Best of luck to you! :thumbsup:

greg1317
02-06-2011, 09:31 AM
see i need it to stretch or something because its getting to bushy with tons of smaller cola's and the pistels are starting to come in great but i need the branching cola's (not the main the other large ones) to stretch out so it will all be able to have space for nug growth i keep thinking the HPS will help slow the plant/leaf growth and make it stretch out more that way i can tie it off and not have to rotate it so much :rasta:

if you want the plants to stretch then switch them to HPS. That will definitely help them stretch.

420atsk
02-06-2011, 04:52 PM
cool thank i will switch it tonight have u ever dealt with powder mold its like dust on 2 leafs

VapedG13
02-06-2011, 08:30 PM
PM is herpes for weed...:wtf: try mixing 1/2 a cup 3% h202 in a 32 oz botttle of water spray your entire plant......greencure is good shit to use against PM......PM usually always returns

A mh light is really good for all aspects of growing...its the only light I use:hippy:

420atsk
02-06-2011, 09:25 PM
so its ok to just spray it on right out of the bottle on to the plant its not better to wipe it down with paper towels/cotton balls and the mix and just hit the infected areas and just keep up on it so that it don't spread up is it still going to bud right and can i flower it and get safe meds from it and should i spray it with clean water after to rinse it off :rastasmoke:


and thats a sick plant what watt light did u use

420atsk
02-07-2011, 06:58 PM
is it ok to cut out new growth there are a few smaller branch's that i think should go for space and light the one's i want to cut out are way smaller and haven't progressed/preflowerd as much its day 7 under 12/12 still with the MH

so will my plant go in to shock if i cut off a few branch's/ what would b clones
if there not super big ones

greg1317
02-08-2011, 04:47 AM
if your plants are healthy they shouldn't go into shock. However, you do not want to be cutting big branches off. If like you said its small enough to be a clone then cutting it shouldn't be a problem.

greg1317
02-08-2011, 04:53 AM
PM is herpes for weed...:wtf: try mixing 1/2 a cup 3% h202 in a 32 oz botttle of water spray your entire plant......greencure is good shit to use against PM......PM usually always returns

A mh light is really good for all aspects of growing...its the only light I use:hippy:

you were running MH with that plant? how many watts were you running? how many plants did you have under each light?

420atsk
02-10-2011, 05:25 PM
wow what the fuck is a dress maker doing on my thread what can you do to help grow meds will ur dress tell me how high 4 my light or how to kill/contain mold what i should & shouldn't b trimming

FUCK NO:mad:

im on day 10 flowering day 3 HPS
its weird my blue dream clone is not standing with her leafs up sky high any more it almost looks relaxed not stressed now my purple nepal it reaching for the light and finally kicking out a bunch of pistels from the lower cola's so i know the 2 clones are female and starting to flower:rastasmoke:

im sure its been asked a million times but how long does it take to show male i have 2 from seed's they seem to be pointy so far no pistels kicking and it there a very small plant are the pollen pod's going to be tiny and impossible to see or are they still going to dangle out right before they open:rasta:

420atsk
02-12-2011, 05:55 PM
still waiting on the seed's to show SEX are the balls going to grow in from nothing and open up overnight and if the plant is tiny (13in) are the balls going to be microscopic and do they grow on the main cola first or can they start from bottom cola's if anyone that reads this know's can u please get back asap

thnx:rastasmoke:

greg1317
02-15-2011, 08:31 PM
hey 420 if you want more help go over to grasscity.com. Cannabis.com is a dead website and hardly anyone posts on it anymore. If you look at the news articles they havnt even been updated in 3 years.