Which LED's to buy

[Anthem]

I’m running as close to a side by side comparison right now with cheese phenos I picked 2 similar from seed plants one is flowering under the sp-250 and the other under a kingbrite with far red and Ir. Been a couple weeks since flower started and already a noticeable difference. Mars works well for veg but needs a little supplementing in my average joe opinion

That sound like a reasonable test, but using a couple clones would help narrow down the data, exactly the same DNA

 

[Moshmen]

Im glad you brought that up. I dont see how or why a plant would be needing more of only a specific nutrient. If nutrient needs increase and they obviously do with fuller spectrums and more intensity rhe plants would need more of everything. I just think calcium tends to show first under stress.

My phillips cmh bulb requires more nutes than the t-5 flourescents in my 3x3 for sure. But i just upped the ec to compensate.

Of course with fertilizer i needed to be even more careful to over feed or have salt buildup with the higher ec in the same size pots so i think the opinion of “mag hungry” or needs more calcium is just what we see first. Adding only cal mag would only be a band aid in my opinion.

Ya all know I’m not nearly as scientific or knowledgeable as you two, however I’m facing this dilemma as we speak , I have added the extra calmag , but I am trying to cut back the calmag to .2 and up 1.0-1.2 of pbp grow - just got done feeding so we will see what happens

 

[Moshmen]

That sound like a reasonable test, but using a couple clones would help narrow down the data, exactly the same DNA

Ya I know it’s not a very good test( they are autos) just opinionated but everyone has one! Lol
Happy growin !

 

[Anthem]

Ya I know it’s not a very good test( they are autos) just opinionated but everyone has one! Lol
Happy growin !

I would not say not a very good test but the way people see things is different and when there is room for speculation people speculate!!!

 

[Aqua Man]

I believe Bruce B references the lighting requirements for Lettuce in his you tube video on PPFD requirements. Lettuce max's out on PPFD at such a low amount of light I would question the valid of a test on lettuce being useful to the outcome on Cannabis.

What about tomatoes? I mean nobody has to agree but I am seeing more than enough evidence all over the place to suggest spectrum absolutely affects nutrient uptake and can influence what ratios would best suit our plants... Further complicating shit and explaining why we see such different results from the nutrients we use and someone else using the same. Also it's no secret that more than a few LED ppl often run into cal issues after switching to LED.

 

[Anthem]

What about tomatoes? I mean nobody has to agree but I am seeing more than enough evidence all over the place to suggest spectrum absolutely affects nutrient uptake and can influence what ratios would best suit our plants... Further complicating shit and explaining why we see such different results from the nutrients we use and someone else using the same. Also it's no secret that more than a few LED ppl often run into cal issues after switching to LED.

I believe tomatoes to weed would prove to be more useful. Secondly, I also believe the spectrum and specifically the far reds and UV change the nutrient uptake of the plant but we have to be careful. I say careful because people are going to assume that because their new LED has far reds and UV LEDS onboard that is the reason why they have experienced larger yields. But they more than likely have a higher PPFD as well. Additionally, I two am of the belief the amount of light drives the nutrient needs of the plant. When you increase PPFD's there is also a need for additional nutrients. Including Cal Mag. I do not fully understand the need for addtional cal mag and incresed PPFD's.

 

[Aqua Man]

I believe tomatoes to weed would prove to be more useful. Secondly, I also believe the spectrum and specifically the far reds and UV change the nutrient uptake of the plant but we have to be careful. I say careful because people are going to assume that because their new LED has far reds and UV LEDS onboard that is the reason why they have experienced larger yields. But they more than likely have a higher PPFD as well. Additionally, I two am of the belief the amount of light drives the nutrient needs of the plant. When you increase PPFD's there is also a need for additional nutrients. Including Cal Mag. I do not fully understand the need for addtional cal mag and incresed PPFD's.

I absolutely agree with you. Light intensity will drive overall nutrient uptake and growth. What I'm saying is the ratio of the nutrient needs may change with spectrum

 

[Aqua Man]

I believe tomatoes to weed would prove to be more useful. Secondly, I also believe the spectrum and specifically the far reds and UV change the nutrient uptake of the plant but we have to be careful. I say careful because people are going to assume that because their new LED has far reds and UV LEDS onboard that is the reason why they have experienced larger yields. But they more than likely have a higher PPFD as well. Additionally, I two am of the belief the amount of light drives the nutrient needs of the plant. When you increase PPFD's there is also a need for additional nutrients. Including Cal Mag. I do not fully understand the need for addtional cal mag and incresed PPFD's.

Trying to relink. Not working... This is one of the papers.

EFFECTS OF LIGHT SPECTRAL QUALITY ON NUTRIENT UPTAKE BY TOMATO

 

[Anthem]

I absolutely agree with you. Light intensity will drive overall nutrient uptake. What I'm saying is the ratio of the nutrient needs may change with spectrum

I agree with you Aqau Man. The challenge becomes how to understand the plants needs as the spectrum changes. If I threw out the PPM's I run people would say I am going to burn the crap out of the plant. But they are happy and no leaf burn.
PPFD is only part of the equation, you have to take into account spectrum as well. There is no way all HPS guys got it wrong going for MH to HPS. The full spectrum term is thrown around way to matter of factly in the LED world. But I agree the plants nutritional needs change as the spectrum changes. In a way I wish I was still running the Growers Choice lights because they had such a different spectrum to the Gavita 1650's. Gavita made some pretty big changes to their 1700 LED, while they told people it was just to reach a waterproof classification I have seen the 1700 up close and they are nothing like the 1650's. Gavita actually removed some of the reds from the light from what I can tell. The Fluence to Gavita spectrum is close to the naked eye. Both seem to have a somewhat HPS warm light feel, but that is all just set of the pants stuff. Reds on both the 1650 and Fluence 2I seem to be about the same number

 

[Anthem]

Trying to relink. Not working... This is one of the papers.

EFFECTS OF LIGHT SPECTRAL QUALITY ON NUTRIENT UPTAKE BY TOMATO

This one might be the one you are looking for
An Update on Plant Photobiology and Implications for Cannabis Production

 

[Aqua Man]

This one might be the one you are looking for
An Update on Plant Photobiology and Implications for Cannabis Production

Read that like 20times... Also supporting. That is a great read I suggest it for anyone interested on learning about spectrum.

This is what kinda made things click about roots under my light

 

[Moshmen]

What about tomatoes? I mean nobody has to agree but I am seeing more than enough evidence all over the place to suggest spectrum absolutely affects nutrient uptake and can influence what ratios would best suit our plants... Further complicating shit and explaining why we see such different results from the nutrients we use and someone else using the same. Also it's no secret that more than a few LED ppl often run into cal issues after switching to LED.

Oh absolutely use more calmag than other growers it’s a balancing act for sure and I can’t explain it at all but the mars and kingbrites require different amounts.

 

[elduderito]

hi guys - I'm looking at some LEDs from europe - what do you guys think based on these stats:


Power consumption: 200W
light output: 400W + / 520 umol / m2 / s

LED: 200 x 3.0W 5050 SMD high end horticulture chip (Made in Japan) - load per LED 35%
Spectrum: Full PAR cannabis spectrum 3410K / 2.62 umol

you gotta scroll down in link below to find it... its the Horizon 400

 

[guymandude]

Not that anyone asked buuuut...

In my 4x4 tent I'm using a Timber 4VS at 3500k for veg/full spectrum (https://timbergrowlights.com/model-4vs/). It pulls 420w from the wall:
View attachment 990504View attachment 990505View attachment 990507

Seems a little underpowered for a full 4'x4' canopy so for flower I'm supplementing with a Trio of Daisies at 3000k spectrum - 'supposedly' better than HPS watt for watt for producing buds. These are like 95w a piece for an additional 285w from the wall I believe (https://timbergrowlights.com/trio-of-daisies-3/):
View attachment 990506

Since the Daisies are pendants you can arrange them how you like which is why there's no PAR map (same spectrum graph applies). *EDIT* Also forgot to add that you can get an extended remote cable to hang the driver outside the tent, helps if you are in a hot area running a grow tent in a non-climate controlled garage :)

Planning to spot-hang the daisies since I have an uneven canopy with multiple strains.

They're worth checking out. I went that way cause I didn't know absolutely one fucking thing about grow lights (just started) but I had seen BAS rave about the Timber COBs on some video so I didn't think it could be a bad place to start.

I'm an engineer by day so I love nerding out on this stuff.

those numbers ain't bad. Here's the numbers on the mammoth lights

Par Maps + Optimal Intensity – Mammoth Lighting

In pursuit of superior results in your grow environment, Mammoth Lighting provides carefully measured and recommended PPFD targets. These readings are meticulously obtained within a 5' x 5' tent to minimize light reflection, a factor often overlooked in 4' x 4' tents commonly used by other...

mammothlighting.com

 

[guymandude]

hi guys - I'm looking at some LEDs from europe - what do you guys think based on these stats:


Power consumption: 200W
light output: 400W + / 520 umol / m2 / s

LED: 200 x 3.0W 5050 SMD high end horticulture chip (Made in Japan) - load per LED 35%
Spectrum: Full PAR cannabis spectrum 3410K / 2.62 umol

you gotta scroll down in link below to find it... its the Horizon 400

well i don;t speak or read german. It'd be nice if you started your own thread on this. thanks

 

[guymandude]

can we keep on topic folks? There's some great data here but it's not regarding my original post. I'm looking for advice on which commerical grade LED to get. The effectiveness of the LED light is not in quesion here, although ya'll have posted some good qeustions and data that deserves their own threads, ok? thanks!!

 

[Tlegacy]

lol. They be smokin’ hahaha

can we keep on topic folks? There's some great data here but it's not regarding my original post. I'm looking for advice on which commerical grade LED to get. The effectiveness of the LED light is not in quesion here, although ya'll have posted some good qeustions and data that deserves their own threads, ok? thanks!!

 

[Aqua Man]

can we keep on topic folks? There's some great data here but it's not regarding my original post. I'm looking for advice on which commerical grade LED to get. The effectiveness of the LED light is not in quesion here, although ya'll have posted some good qeustions and data that deserves their own threads, ok? thanks!!

Guilty and your absolutely right.

 

[bigslimdawg79]

Guilty and your absolutely right.

Gavita + fluence two dope brands

 

[Tlegacy]

personally I will have to figure out fluence diodes, . Even if it requires me to buy shares in the company. Even then I bet they won’t release it. I want to buy one but the are so secret. They do t want anyone stealing their technology, but in reality they don’t know that China will buys some and reverse engineer it. Hahaha

Gavita + fluence two dope brands