Need help choosing LED

And as for my eyes, like I have said previously, my EXPERIENCE as a welder (Mig/Arc mainly) which is also ANECDOTAL before you come running in like capt rite trying to disprove what was already mentioned as anecdotal to MY experience, the same effects were incurred on my SAID eyes with my LED panel. Do you find that slightly coincidental or just hey.. his eyes don't like red/blue/white lights. ...

Or is it this... just because he's a welder he doesn't know wtf he's talking about?
UV regardless of its god damn source, will cause your eyes to do the same as arc eye in welding at high enough concentrations. Jesus F christ

The OP can make his own decision and research. Sure as hell doesn't need us trying to discredit each other over something that will WORK regardless whether its Chinese LED or USA. Or whether he gives a flying fuck if you believe Chinese/EPILEDs are falsely advertised with regards to UV.

Buy the $600-800 LED panels if that's the OPs choice with CREE stamped on everything.

I bet you $100 he prob doesn't give a SHIT except to grow some bud. Kinda like me. :S
Again, my cheap panel works and grows bud just fine. Still not seeing the problem here with my cheap LEDs.

Again, you want UV-b...everything you have presented is UV-A....UV-b is what Plants crave and look it has a higher photon energy...

UV-A does nothing for plant growth....except for you.

Uvb - 280-315...

Don't devole your shit, you lack facts, try to interject with personal experience and look foolish.....To answer your question on lying or fake....ITS both numbnuts.

The diode spectrums used are for making money not for making horticultural harmony.


Again, which PAR lamp do you recommend?

That is probably the single most important concept in picking an LED light....

Would you pick 20% of a return or 40% of return as your BASELINE and then tweak spectrum?

Fuck PreMADE Panels without EXact Specifications and ambiguous data....Buyer Beware!

420PyRoS said:

And as for my eyes, like I have said previously, my EXPERIENCE as a welder (Mig/Arc mainly) which is also ANECDOTAL before you come running in like capt rite trying to disprove what was already mentioned as anecdotal to MY experience, the same effects were incurred on my SAID eyes with my LED panel. Do you find that slightly coincidental or just hey.. his eyes don't like red/blue/white lights. ...

Or is it this... just because he's a welder he doesn't know wtf he's talking about?
UV regardless of its god damn source, will cause your eyes to do the same as arc eye in welding at high enough concentrations. Jesus F christ

Click to expand...

I knew a welder one time. What a piece of shit. Did I hyperbole too much yet?

Abiqua said:

Again, you want UV-b...everything you have presented is UV-A....UV-b is what Plants crave and look it has a higher photon energy...

UV-A does nothing for plant growth....except for you.

Uvb - 280-315...

Don't devole your shit, you lack facts, try to interject with personal experience and look foolish.....To answer your question on lying or fake....ITS both numbnuts.

Click to expand...

When did I ever say UVA does anything? Other than my anecdotal evidence to say UV has helped me?
You were the one who claimed 320-400 wasn't UVA. Not I.
You claim my LED's are falsely advertised, not I.
You claim blackstar LED's don't use 380 nm diodes and claim they haven't updated their led tech in 7 years. But yet they use CREE, and BridgeLux etc. I didn't claim this.

You make so many claims, then try to back claims that are so full of hot air.

You're right tho on the UVA probably having no positive effects, but I have no evidence to say yay nor nay no the educational background on the subject of UVA or UVB.
But it is there, despite you saying it isn't or it's falsely advertised.

UV-b diodes are w280-315nm fyi.....and expensive as fuck as well as desirable for a build according to the prevailing theory of current photo biology, not based on a "feeling"....

That is not discrediting your welding experience, it just means I don't give a flying fuck with talking about Light Emitting diodes.

Abiqua said:

I knew a welder one time. What a piece of shit. Did I hyperbole too much yet?

Click to expand...

Derp

420PyRoS said:

When did I ever say UVA does anything? Other than my anecdotal evidence to say UV has helped me?
You were the one who claimed 320-400 wasn't UVA. Not I.
You claim my LED's are falsely advertised, not I.
You claim blackstar LED's don't use 380 nm diodes and claim they haven't updated their led tech in 7 years. But yet they use CREE, and BridgeLux etc. I didn't claim this.

You make so many claims, then try to back claims that are so full of hot air.

You're right tho on the UVA probably having no positive effects, but I have no evidence to say yay nor nay no the educational background on the subject of UVA or UVB.
But it is there, despite you saying it isn't or it's falsely advertised.

Click to expand...

You keep claiming that UVA grows your plants better than without, literall the 1st post...Did you finally look and realize that UV-A has a fairly wide range of NM

Abiqua said:

UV-b diodes are w280-315nm fyi.....and expensive as fuck as well as desirable for a build according to the prevailing theory of current photo biology, not based on a "feeling"....

That is not discrediting your welding experience, it just means I don't give a flying fuck with talking about Light Emitting diodes.

Click to expand...

Arc eye happens in UVA range too, DERP

Abiqua said:

You keep claiming that UVA grows your plants better than without, literall the 1st post...Did you finally look and realize that UV-A has a fairly wide range of NM

Click to expand...

I did? I thought I said anecdotal to my grow... derp

Again, one more time..........

Abiqua said:

You keep claiming that UVA grows your plants better than without, literall the 1st post...Did you finally look and realize that UV-A has a fairly wide range of NM

Click to expand...

What would that range be might I ask? 320-400 like I've been saying? wtf. You're a southern American aintcha?

NameAbbreviationWavelength(nm)Photon energy(eV, aJ)Notes / alternative names
Ultraviolet AUVA315–4003.10–3.94, 0.497–0.631Long wave, black light, not absorbed by the ozone layer
Ultraviolet BUVB280–3153.94–4.43, 0.631–0.710Medium wave, mostly absorbed by the ozone layer
Ultraviolet CUVC100–2804.43–12.4, 0.710–1.987Short wave, germicidal, completely absorbed by the ozone layer and atmosphere
Near ultravioletNUV300–4003.10–4.13, 0.497–0.662Visible to birds, insects and fish
Middle ultravioletMUV200–3004.13–6.20, 0.662–0.993
Far ultravioletFUV122–2006.20–12.4, 0.993–1.987
Hydrogen Lyman-alphaH Lyman-α121–12210.16–10.25, 1.628–1.642Spectral line at 121.6 nm, 10.20 eV. Ionizing radiation at shorter wavelengths
Vacuum ultravioletVUV10–2006.20–12.4, 0.993–1.987Strongly absorbed by atmospheric oxygen, though 150–200 nm wavelengths can propagate through nitrogen
Extreme ultravioletEUV10–12112.4–124, 1.99–19.87Entirely ionizing radiation by some definitions; completely absorbed by the atmosphere

https://en.wikipedia.org/wiki/Ultraviolet

Basic understanding of UV .... omg its wiki... they are fake and wrong too!

Like beating a dead cat ffs.

Oh funny that, on wikipedia on UV ... the picture on the right is what? A welder... the one's who deal with this type of bs the most.

UV-A is not desired is it? You need to do some reading. You always spout shit with nothing to back it up with.

Again, from scholar... have a nice read. This is based on a birch tree seedling but the science behind it is what you need to focus on.


http://treephys.oxfordjournals.org/content/30/7/923.full

Effects of solar UV-A and UV-B radiation on gene expression and phenolic accumulation in Betula pendula leaves

1. Luis O. Morales1,2,
2. Riitta Tegelberg1,
3. Mikael Brosché1,
4. Markku Keinänen3,
5. Anders Lindfors4 and
6. Pedro J. Aphalo1

+Author Affiliations

1. [email protected])
2. Next Section
   Abstract
   Ultraviolet (UV) radiation is an important environmental factor for plant communities; however, plant responses to solar UV are not fully understood. Here, we report differential effects of solar UV-A and UV-B radiation on the expression of flavonoid pathway genes and phenolic accumulation in leaves of Betula pendula Roth (silver birch) seedlings grown outdoors. Plants were exposed for 30 days to six UV treatments created using three types of plastic film. Epidermal flavonoids measured in vivo decreased when UV-B was excluded. In addition, the concentrations of six flavonoids determined by high-performance liquid chromatography-mass spectrometry declined linearly with UV-B exclusion, and transcripts of PAL and HYH measured by quantitative real-time polymerase chain reaction were expressed at lower levels. UV-A linearly regulated the accumulation of quercetin-3-galactoside and quercetin-3-arabinopyranoside and had a quadratic effect on HYH expression. Furthermore, there were strong positive correlations between PALexpression and accumulation of four flavonols under the UV treatments. Our findings in silver birch contribute to a more detailed understanding of plant responses to solar UV radiation at both molecular and metabolite levels.

Now click the link and read the rest dumbass.

Both groups of phenolics act as sunscreens in the leaf epidermis protecting the inner cells from the harmful radiation (Jordan 2002, Bassman 2004) while transmitting photosynthetically active radiation (PAR) to the mesophyll cells. Gene expression is also altered when plants are exposed to UV-B (Brosché and Strid 2003), and genes on the general phenylpropanoid and flavonoid pathways are activated before the accumulation of phenolics takes place. It has also been reported that wavelengths in the UV-A region induce the accumulation of epidermal flavonoids (Ibdah et al. 2002 and references therein) and gene expression (Christie and Jenkins 1996). Additionally, families of transcription factors such as MYB (Hemm et al.2001) and bZIP (Ulm et al. 2004, Brown and Jenkins 2008) play a key role regulating gene expression in response to UV-B radiation. Thus, both gene expression and phenolic accumulation appear to be wavelength-dependent processes.

Abiqua said:

Again, you want UV-b...everything you have presented is UV-A....UV-b is what Plants crave and look it has a higher photon energy...

UV-A does nothing for plant growth....except for you.

Click to expand...

Forgive me if I trust science, and controlled testing to be more accurate to the FACTS, than what you fuckin believe, Abiqua.

I am more than ever convinced UVA is required for plants... even though I originally was trying to focus on UVB until realizing mine is UVA .. but meh, now it works. Imagine that.

I'm sure this is all in those LED datasheets you read. Cree invented plants after all.

Went with the vero 120.. Hope it won't be overkill..

Zulu Smoker said:

Just realised you have a two foot high space - you might want to investigate if the 120W model will bleach your plants. I have no experience with a space that "short". These lights are pretty strong.

Click to expand...

Even at 16"

RiseUp said:

Thanx justugh, mite have to look into one asap

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I know this threads old but you can get a 182w and 300w Mars led off Amazon for less that a hundred bucks with shipping. Give or take for tax.

Growinthesnow said:

I know this threads old but you can get a 182w and 300w Mars led off Amazon for less that a hundred bucks with shipping. Give or take for tax.

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Ooh really, but i already went with optic. Thanks fur the input.. Would the optic produce nugs an a wholotta weight than the to mars?

The penetration is a lot different when the lights are designed to be spotlights rather than floodlights. One of the major complaints with old LED designs is the lack of penetrative power, which the cob design has largely improved upon. It's only obvious as to their industrial uses, which are high bay lamps, street lighting, and various high powered applications.

On that note, if all aspects were the same they'd grow the same, but keep in mind that what Mars advertises as 300W may be less efficient than your 120W Vero29-based light. And when it's less efficient the extra power is thrown out as heat, which adversely affects environments in closed environments. And they eat up a lot of power too. Better long-term savings when paying for an efficient light up front.