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Lordy! That is richer than the perimiter of the horses' 10 year old manure pile. Still I wouldnt' worry about high EC ;)

Though this brouhaha over spectral distributions may seem academic, a rating for lamps in terms of photosynthetically effective lumen output would be very useful and a value functionally equivalent to the simple mathematical approach outlined above could be done by a simple computer program if...

Yes and yes though I had hoped that LED luminance values werereaching levels that would make them equal or superior. But apparently notyet. See next post.

OK, but now I have to eat humble pie. Thinking it over I see that what one would have to integrate is the product of the PAR and the intensity spectrum of the lamp. The first stab at this was off the top of my head and is just plain wrong. But I often get things wrong the first go round.

Yea, but its spectrum is more complicated and to say anything acurate about its efficiency I would, for starters, have to take a difference between the definite integral of its curve and the PAR curve but the bulb's curve is not continuous over its range and therefore not analytic-- so I cheated...

The first graphic below shows the relation between wave-length and relative photosynthetic activity. I have superimposed that response curve over what I call the "wrong spectrum" and both LPS and MH spectrums which shows why the latter two are not wrong though not ideal. The photo synthetic...

I just went out and took an E.C. measurement on some of the richest organic soil you could imagine and got a reading of 0.21 so I think you should not worry about piling on properly composted organics.

And here is a quote from Mr Nice Seedbank on their G13 Haze

Your welcome, sorry I havn't any experience with cannabis to share. BTW After getting that advice I purchased a Hanna HI98331 direct reading soil conductivity meter. But I'm going to be using “chemical” ferts. It's hard for me to imagine that using organics high E.C.s could be a...

I really don't know. That was the advice I got at Mr Nice's, that's what I'm going to try.

No problem, I do appreciate the help.

Just as lumens don't mean squat if they are in the wrong part of the spectrum.

Right, sorry I wasn't clear, < one inch describes the width of the fixture not the bulb which is, of course, 5/8 inch.

I'm using the Sun-Blaster single bulb units. They are verylightweight and under an inch wide. The &#8220;housing&#8221; is highlyreflective aluminum. At the least I will paint the back-panel brightwhite. I'm going to do some experiments with applying some dualmetalized Mylar film with spray...

In truth the main reason I'm using the LEDs is that I already have them. But It is not fair to compare LEDs to other sources directly in terms of lumen values without comparing how the spectra of the lights' plot against the PAR PAR...

Here is a schematic of what I am building. All the lights are enclosed in the same air cooled housing.

I've been advised that the Mr Nice G-13 Haze is senstive to over feeding and that one should start low and slowly build the nutrient level up to an EC of 1.6

I'm going to augment my LED panels with HO T5s. Is any one here flowering with T5s and what (pseudo) color temp are you using. thanks pawpaw

Not ready to try germinating any yet but I have to give my highest marks to Attitude for their truly excellent service.

Thanks for all the suggestions. Kong is reportedly discontinued so C-99 goes on top, but it's out-of stock at Attitude, and they have truly earned my loyalty, so I think I'll wait before placing my last order at least until C-99's back in stock. A question for Mutt, as to the general afghan...