Led Users Unite!

GreeneryBob

GreeneryBob

Well-Known Member
JJSG said:
Hey guys just want an opinion on this light as in thinking of getting it?
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You're likely going to buy the light and it'll grow a marginal little plant and you'll get sick of the awful purple light and stop growing. When you're ready to start growing, throw that light away and get something better. Most of the ebay and amazon chinese lights are just toys HLG is good.
 
JJSG

JJSG

Member
Rocket Soul said:
Id take a very hard pass on all of those. Its blurple, amazon and no real dets on any of the chips nor wattage (1200w is not the actual draw) = the trinity of no go.
Look up quantum boards here on the forum instead, i think theyre on Amazon aswell.
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I already have a 600w LED one but fancied a bigger one for when I go up in size on the tent, thanks for the input though I shall scrap that idea and look at quantum boards.
 
JJSG

JJSG

Member
GreeneryBob said:
You're likely going to buy the light and it'll grow a marginal little plant and you'll get sick of the awful purple light and stop growing. When you're ready to start growing, throw that light away and get something better. Most of the ebay and amazon chinese lights are just toys HLG is good.
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Nice one mate, wanted as a replacement when I upsize, shall stay away and check out the quantum boards as rocket soul suggested above, thank you for the input
 
coreywebster

coreywebster

Well-Known Member
Rocket Soul

Rocket Soul

Well-Known Member
JJSG said:
Nice one mate, wanted as a replacement when I upsize, shall stay away and check out the quantum boards as rocket soul suggested above, thank you for the input
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You can also build your own light if thats your fancy, a fair bit cheaper and not as hard as youd think. Stick to quality diodes: samsung lm561c or lm301b, or bridgelux eb gen 2.
 
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JJSG

JJSG

Member
Rocket Soul said:
You can also build your own light if thats your fancy, a fair bit cheaper and not as hard as youd think. Stick to quality diodes: samsung lm561c or lm301b, or bridgelux eb gen 2.
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I havnt got the know how or time to do it now I'm back in work, rather just buy one for now Haha, thanks mate
 
JJSG

JJSG

Member
coreywebster said:
Will it fit in the loft? You can get loft tents if not.
Either way you want around 30w per square foot with them type of LEDs
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The loft is only a temporary thing I'm renovating a shed at the bottom of the garden for the bigger grows, just got to get insulation boards and run power down there and that's ready
 
arkady

arkady

Member
His prices are fair. He also does his own builds called scope.

I'm looking into LED light for my 1.5x1.5 tent and I this seem like a good purchase. I was wondering if it would be enough to cover the area with 2 plans in it?

It so hard to figure and choose the best one
 
Rushin

Rushin

Member
I recently bought a 135w 4000k V2QB from HLG ,....I plan to grow in a 3x2x6.5' (2 plants) cab I built, I'm hoping this light is going to be enough for the 1st grow....thought of using cfl's as side lighting...never too much light right ( ?), but what spectrum makes sense to use as this is for veg and flower.....it was suggested that the 4000k would be OK for both....any thoughts?
 
coreywebster

coreywebster

Well-Known Member
arkady said:
His prices are fair. He also does his own builds called scope.

I'm looking into LED light for my 1.5x1.5 tent and I this seem like a good purchase. I was wondering if it would be enough to cover the area with 2 plans in it?

It so hard to figure and choose the best one
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2 plants in a 1.5x 1.5 , I imagine you mean feet, in which case yes its plenty.
 
coreywebster

coreywebster

Well-Known Member
Rushin said:
I recently bought a 135w 4000k V2QB from HLG ,....I plan to grow in a 3x2x6.5' (2 plants) cab I built, I'm hoping this light is going to be enough for the 1st grow....thought of using cfl's as side lighting...never too much light right ( ?), but what spectrum makes sense to use as this is for veg and flower.....it was suggested that the 4000k would be OK for both....any thoughts?
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The 135w kit is good for a 2x2 foot space but it does crank up to about 150w so would be enough for a 3x2 if you add a couple of cfl, although I would add a couple of screw in LEDs rather than cfl personally.

You want to aim for 30w per square foot, but I know a couple of people running 21-25w per square foot and doing really well.
3000k or 4000k is fine for both veg and flower.
 
Randomblame

Randomblame

Well-Known Member
Fawkes420 said:
Found this on the net - https://www.waveformlighting.com/horticulture/convert-lux-to-ppfd-online-calculator

EB2 has 80 CRI which is considered as low? According to this guide - https://www.flexfireleds.com/color-rendering-index-cri-and-led-lighting-what-is-cri/,,,
"- Lights with a CRI that is measured greater than 80 are considered to be more than acceptable for most applications.
- Lights with a CRI that is measured greater than 90 is generally considered “High CRI” lights.".

So,,,, if i load 40000 lux and "low cri led 3500k" in the calculator in the first link i'll get 641.48 umol/s/m2.
But if i take 641,48*71 i get 45545?
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CRI80 and 90 have different efficiency and when you measure lux and set both to the same wattage you would get more lux from CRI80 cause lux meters are made for human eyes and have a green filter integrated to favor green(brightest for the human eye).
CRI90 has a higher QER(~5} like CRI80(~4,8 ) which means a better, more efficient spectrum for CRI90. But CRI80 has higher LER which means its more efficient in converting energy into light.
In the end 40klx CRI90 are more useful for plants like 40klx CRI80, yes, but you need ~10% more energy to create 40klx in CRI90.

The waveform calculator is made to favor their own products. It's not really useful to compare CRI 80 and 90 just based on lux without mentioning the used wattage.

Visit https://www.led-tech.de/de/system-light they have a nice spectrum calculator for Samsung LM301b boards and strips and additional Osram Oslon/Square strips you can add to the list. You can add more or less diodes, you can chose different drive currents and it calculates watts used, μMol/J, μMol/s PPF, CRI and lumen output.

You want CRI90 but more efficient like CRI80 and far better than CRI90 efficiency?
Take the brightest and most efficient 4k/CRI80 diodes for instance Samsung LM301H and add 15-20% of the best available deep-red diodes on a separate boost circuit. CRI shifts to CRI89-91 and because of the added deepreds the spectrum shifts to ~3500°k. Deep-red's are the most powerful diodes and they produce the most usable photons. Blue is more elect. efficient but blue photon carry twice as much energy therefor red diodes have twice as much photons per watt.
So with adding deep-red you can make your base light more efficient.
If the budget does not matter you could even achieve an efficiency of up to 3.0μmol/J, system efficiency still ~2,8! HPS has 1,3-1,4, CMH creates up to 1,9μMol/J. Sammys new horti strips create 2,74μMol/j, system efficiency probably still 2,55.

You can already get commercial fixtures reaching 2,7μMol/j. Amare's bar8 or fluence spider2i for instance. Not cheap but they demonstrate how efficient the strip design is when it comes to plant lighting. Shortest distance paired with unbeatable uniformity and penetration leads to less light loss and highest system efficiency.
 
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Sir420

Sir420

Active Member
Sir420 here live & in full effect ✊.. I have been doing deep digging just like the rest of the LED community & have came to the conclusion based off of the data I collected, that Vertical SoG with the latest LED gear is the most efficient (more grams > less wattage)
Growing method for perpetualgrowers looking to maximize efficiency & time instead of quality & quantity! Most clearance for indoor growing is 8-10 ft which can allow 3-5 rows of canopy vertically and the key to me saying using the "latest LED" is because you can dim them to lower wattage while maintaining same ppfd evenly acrosscanopy.. while thinking of my perfect DiY vertical SoG rack system my focus was efficiency over budget over quality over quantity .. because efficiency is those things all in one sort of.. if anyone can correct me LM301b is still the most efficient led strip on the market today in stock lol & how come I don't see any vertical rack journals if it's suppose to be the most efficient way???
Would loveee feedback & constructive criticism I am looking to build a 5x10 system and my ceiling height is 9 feet, how many LED strips would I need to buy along with matching drivers?? Remember pls REMEMBER I want to keep them less than 10 inchs from canopy to minimize wattage &maximize ppfd efficiency so I understand it will be a little more costly... I think I could do 3 stacks high 5x10x9.. 2-3 plants per sqft (separate mother tent to get clones from) anywhere from 6 to 10" away from canopy.. I can't estimate the wattage but I do know whatever I use I can expect a gpw of at least 1.5 due to distance from canopy and "latest LED" tech along with perfect environment & feeding conditions.. how many watts would I need if I am certain to pull on a bad day 1.5 gpw & I'm trying to achieve at least 4-5lb/month?? Plz tag any knowledgeable ppl who would be happy to chat and discuss HOW MUCH WATTAGEDOES MY SPACE NEED TO PULL 4-5LB IN A 3 RACK (MAYBE 4) VERTICAL SOG RACK SYSTEM COCO 5x10x9 ???
 
coreywebster

coreywebster

Well-Known Member
@Sir420 SOG of any kind is less popular due to the required plant count which matters to legal and illegal growers depending on sentencing guidelines or state laws in legal states.
 
Sir420

Sir420

Active Member
@coreywebster I have to agree. Lawmakers must know something we don't lol with this plant count stuff I wish it wasn't a limit! So let's say we can dream a bit you know and I was trying to light a 5x10x9 space I figured getting 1.5gpw with 5 elbows takes 1500 watts but how many strips will I need to increase efficiency high enough while maximizing low wattage. Most ppl run their strips at 75% so if I leaned towards 40-50% I would have to buy more strips but idk the math formula for ratio between percent to run each strip at to determine sweet spot for high ppfd : low wattage.. do you know any helpful members you could tag or point me to for help?? Thanks my man cheers
 
jarvild

jarvild

Well-Known Member
Sir420 said:
@coreywebster I have to agree. Lawmakers must know something we don't lol with this plant count stuff I wish it wasn't a limit! So let's say we can dream a bit you know and I was trying to light a 5x10x9 space I figured getting 1.5gpw with 5 elbows takes 1500 watts but how many strips will I need to increase efficiency high enough while maximizing low wattage. Most ppl run their strips at 75% so if I leaned towards 40-50% I would have to buy more strips but idk the math formula for ratio between percent to run each strip at to determine sweet spot for high ppfd : low wattage.. do you know any helpful members you could tag or point me to for help?? Thanks my man cheers
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A couple of questions if your going the strip route. What means are you going to use to waterproof the strips between each shelve?
Samsung has a calculator for there led's. https://www.samsung.com/led/support/tools/engine-calculator/
 
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