exoticrobotic
Well-known member
Why that particular combination?
What do you feel both those lights bring to the table if you don't mind me asking?
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CMH vs LED vs HPS
- Thread starter Gerardbutler79
- Start date
Why that particular combination?
What do you feel both those lights bring to the table if you don't mind me asking?
CMH has the best spectrum, efficacy, and lifespan. I did a HPS vs CMH long ago. They crushed HPS in my garden. They also add the heat I need in the cooler months. My veg space is 100% CMH. I'm still an old school grower with no automation. Mixing CMH/LED I was able to reduce my power use as well. My plants love CMH.
If your a strictly hobby grower in no more then a 4x4 then use CMH they can't be beat all around
For most photons for the money - hps
I see people use 3 x 315 In parabolic hoods inside a 4x8 with great success
If we follow the numbers, I think I can produce same results with 3 x 250 hps in the same hoods
For most photons for the money - hps
I see people use 3 x 315 In parabolic hoods inside a 4x8 with great success
If we follow the numbers, I think I can produce same results with 3 x 250 hps in the same hoods
U know pic or it didn't happen
Dang. I thought I was posting in the original CMH thread 
There are a number of growers that I respect on this forum that are growing quality cannabis using LEDs; I have no doubt it can be done. I'm just old, lazy, and tight, so I'm rolling with the cheaper and known option.
There are a number of growers that I respect on this forum that are growing quality cannabis using LEDs; I have no doubt it can be done. I'm just old, lazy, and tight, so I'm rolling with the cheaper and known option.
exoticrobotic
Well-known member
New 250 HPS working well at the moment. Better yield than CMH although cmh bulb is a few years old , slightly less resin but more buddy flowers, less leafy flowers.
exoticrobotic
Well-known member
Sure. Leds need a bit of experience to get the best out of them.
any noob can get a good crop with hps, cmh.
I do great with them
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But it takes a REAL masochist to try to get a good crop with LED's. LOL!any noob can get a good crop with hps, cmh.
It's like anything, generally there is a learning curve, slopes may vary per product and individual.Sure. Leds need a bit of experience to get the best out of them.
any noob can get a good crop with hps, cmh.
I do great with them
Everything I see in LEDs is awesome to be honest they really grow (kinda weird mutant like) big plants and buds
It's just a shame that the outcome of using them is mostly hairy calcium stalks (which for me is the explanation as to why cal mag appeard in the indoor scene at the time LEDs was being popularized)
I mean I never heard about it before and never needed it..
Back to the stalks, I'm left to wonder why a lot of people find that their plants are calcium hogs... The answer is in the stalks.
It's just a shame that the outcome of using them is mostly hairy calcium stalks (which for me is the explanation as to why cal mag appeard in the indoor scene at the time LEDs was being popularized)
I mean I never heard about it before and never needed it..
Back to the stalks, I'm left to wonder why a lot of people find that their plants are calcium hogs... The answer is in the stalks.
exoticrobotic
Well-known member
Dont get me started on Calcium with your click bait @snakedope
Why do plants suddenly need extra calcium under different lights?
Can someone convince me its not all a load of bollocks?
I'm not saying it's a fact, but it seems that most LEDs growers claim they need cal mag all the time and more then usual correct me if I'm wrong you know we're all potheads here lol
The only explanation I can see is that the plant under LEDs using way more calcium, but the real question is where does it all go ?
I don't know.. seems possible, you are what you eat and drink, same as plants.
The only explanation I can see is that the plant under LEDs using way more calcium, but the real question is where does it all go ?
I don't know.. seems possible, you are what you eat and drink, same as plants.
I probably can't change your mind but- I grew for 7,8 years with CFL's before I gave in and started using LED's. Suddenly I had tons of problems, mostly plants that wouldn't uptake any liquid. So I read on ICMAG that Cal-Mag was the solution. And for me, it DID straighten out my crop, especially the 'plants won't eat' one.Dont get me started on Calcium with your click bait @snakedope
Why do plants suddenly need extra calcium under different lights?
Can someone convince me its not all a load of bollocks?
But after three years of trying with LED's, and three years of disappointing crops, I made the decision to go BACK to my earlier source of light, CFL's. I didn't change anything else, and I still add Cal-Mag, and now my plants are bigger and healthier than ever. I don't know if the Cal-Mag has positive benefits under CFL's, but there arent any negatives, so I'll keep using it. Hope this helps.
Cal mags use has been preached long before Leds were involved. LONG before, and here is why. Overuse of calcium prevents and masks other issues. The reason people have been saying they needed more cal mag under leds is because they upped their ppfd which means they need more overall feed. I have not had to supplement any additioncal cal mag specifically but when i fed at same ec as i did under hids the plants got hungry in the past. Now with a slightly stronger feed to keep it adequate with the more intense lighting all parameters are in check. I still never exceed around a 2.2-2.4 ec though. These people cranking 3.0-4.0 ec make no sense to me.
greyfader
Well-known member
exactly right! i base everything on the plants' need for nitrogen. if that is about right everything else lines up using jack's 3-2-1.
at around ec 2.4, i will start using about 90% of that to dial the solution back down a little.
i have never used a combined cal-mag product.
we do need more magnesium for leds. i think because both the spectrum is more complete than hps and the multipoint lighting is driving a greater surface area unshaded.
magnesium is the central element in all chlorophyll types.
Intense lighting?
What am I missing here, is a 800w 120k lm panel is more intense then a 1000w 160k lm hid ?
Especially a strip panel that spread it all over the place vs a single localized source ?
According to your logic the plant underneath the 1000 hid would need to be fed more then others aswell, did you find this to be the case in your previous hid grows ?
Weve gone over this before my friend. In a given space 4x4 5x5 etc the average ppfd, thats photons that we are spreading in total of an area, is higher with LED than HPS is capable of in the same area. You can easily achieve a higher ppfd with an LED than 1000w HPS. Thus, in the same space, we now have more total photons to satisfy, with light being our highest driving cardinal parameter. This is why we need to feed more, because we now have more total photons in a given space. Average ppfd of a 1000w de hps brand new bulb and ballast with brand new clean hood = 1200 at best, you could achieve 1500+ with a 700w LED, in the same space. Each individual diode of course doesnt have the intensity of one 1000w bulb, its about the total photons/ppfd in your space as an average. But yes, if some plants under hps (directly beneath) are seeing a higher ppfd than outside plants(they are), they would be able to benefit from higher feed. Whereas the outside plants would not benefit. Co2 is similar in this sense. Cannabis yield doesnt benefit from co2 unless we see a ppfd above a certain level. No reason to supplement co2 if your average ppfd is under 5-600 imo. But if your average ppfd is 7-800+ there is a lot of science to show a 20-30% yield increase from co2 around 1200ppm. All cardinal parameters drive each other.Intense lighting?
What am I missing here, is a 800w 120k lm panel is more intense then a 1000w 160k lm hid ?
Especially a strip panel that spread it all over the place vs a single localized source ?
According to your logic the plant underneath the 1000 hid would need to be fed more then others aswell, did you find this to be the case in your previous hid grows ?
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My males flowering under the cheapest LED light known to man lol.. All kidding aside this LED surprised the hell out of me.. It's a true 800w light that someone found on Amazon. I checked the specs which seemed OK. It cost a whopping $250 for the version with a remote . It's working perfectly with my males and any reversed females. It was bought for that. I've already finished a few female reversals under it. I haven't tried to flower until harvest any females. I had to pull out the 1st try. I figure if I can get 3 years of use its paid for itself. Here is a link to that thread if any are interested.
. It's working perfectly with my males and any reversed females. It was bought for that. I've already finished a few female reversals under it. I haven't tried to flower until harvest any females. I had to pull out the 1st try. I figure if I can get 3 years of use its paid for itself. Here is a link to that thread if any are interested. $229 for 800w LED.....how bad can it be?
While in search of an inexpensive led for a 4x4 tent...I found this *link removed by moderator* first thing is in description it says 800w but dig deeper and it's only 680w. Money is tight so it will definitely give the most bang for buck. Even claims samsung 301 series chips. But it's almost...
www.icmag.com
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Anyway, I'm just saying in any case it doesn't matter led or hid more photons is more, if your panel totals at 110k lm and a hid is 160 so how are you creating more light with your led ? Your not, your just spreading it
But that's not what that's about, the main thing is if a plant is under intense lighting it should uptake more, but we never saw such a need for calcium in HIDs ! That's the point.
Look up the average ppfd of a 1000 w hps vs the average ppfd of high end leds. Its higher. This is why they need more food. Its that simple dude. And unless you personally experimented with feeding more to plants localized directly beneath your hps before you never saw a need because you didnt know you needed it. Potential hadnt been seen, if i knew back then what i know today i would have altered things for sure.
