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I'm just gonna say this one last time. I've had leaves TOUCHING my coral waves, no problemo. Hope all is well for everyone. Remember, yield has as much to do with root ball size as light quality, (poor quality light can actually increase yield while decreasing [cannabinoids]/gram) peace, MPP

I agree that Ed was making the point you just made yea. But "better job" is the subjective part. I have very good understanding of the quality limitations of HIDs and I assure you PAR approach will produce the finest medicine possible (not the MOST as with many industries/processes...

Dig, I'm mostly organic so I don't even bother with EC but I def see the advantages. I knew a guy once who said he just left bathroom scales under his plants and used that to tell when to water and how much etc. Based on what they drank he nuted appropriately. Sounds like you got a handle on it...

Just a fleeting thought: where are you taking your humidity measurements? Because you will always be closer to 100% above a body of water (moreso the warmer it is). If you have standing water under the plants you may be asking for it. Could always just rig hoses to the bucket bottoms and have...

Yea those guys (grow light source) sell the induction light I'm looking at, also some dialed in LED units that supposedly have been widely tested. Nice quote on the spectrum deficiency stuff, in so many words that's what I've been trying to say. The high yellow-blue of HPS (traditional, not blue...

Dig, hey if it was me (definitely isn't) I'd source some mylar--I prefer pounded--and just encircle the area with it, save every photon of that CFL output :) MPP

An addendum: since lumens are a measure of visible light ("visible" to humans has an efficiency peak in the yellow/green) yes it is all about lumens/watt for "penetration". However methods like SOG and SCROG which try to focus the growers attention at the very top of the canopy often are...

My understanding is that the INTENSITY (sheer lumen output) is what drives the HPS penetration. That and the fact that the wavelengths of light which are the largest spectrum output match some of the most reflected light (off of the canopy itself): Yellow and Green So shoot tons of yellow and...

RE: Clonex: you can find IBA on amazon (pure which you mix down--get b1 or whatever and add too) for about the same price as a clonex jar that has probably 1/100th the IBA in it....just puttin that out there, id imagine Ebay has people sellin it too, MPP p.s. also didn't realize that was crystal...

I believe willow branch tea is known to work as well (natural source of PGRs--salicylic acid and rhizocaline) MPP

Sure thing aoyanagi! Feel free to pm or post here, cool of you to take the initiative with the professor. Hope the results are helpful! MPP

Ill start with the 6500K Yes, especially as bulbs can be referred to as 6500K and differ from even the average by admitting a CRI lower than 100 (highest I've heard of was 95 CRI on a CFL and 90 CRI on a t5) Lumens are visible light yes, but measured the way our eyes see. And if you look at the...

No probs, just tryin to give back. The chart is from wiki---groovy tho right? funny how the most useful stuff sits right under your nose. All the best to ya MPP

Anytime bro, I just object to the concept of "wasted" lumens as all visible light is involved in PUR (photosynthetically-USED-radiation) I know the PAR graphs make the yellow/green look insignificant, but if you have ANY KIND OF CANOPY AT ALL you will want them. see my earlier posts for why. MPP

advice is just that, take it or leave it. but I think I feel good still about giving it as my motivation is to be helpful.

you may want to aim a little higher, I'm at a uni and have a prof who specialized in PAR and even he only has a "PAR" meter, havent identified it from the pdf I posted pages and pages ago, but I plan to when I see him next.

I believe ya The bulb spectrum you are putting forth seems a little unbalanced to me as it wouldn't have enough blue/yellow and thus would be "poor quality" light by being unbalanced. Take a page from lucius and throw a 6500K in and you should be good, honestly i'd pitch a full red bulb if you...

I myself only learned on this very thread only pages ago: TTFN

the flux density 1? Honestly I found that so long ago and so many other studies I found were because of that I just assumed everyone knew...been spending winter break wisely, piling up the archives.... check this out...

these are my own words fyi, you have my permission to repost but with credit via link so the whole thread is cited etc (this has been a communal project, lead by respected members of the forum) Hey all this was originally just a pm I sent to undercover but he said it was helpful and I guess I...