315W CMH SIngle Plant DWC SCROG.

Enigma

Enigma

Well-Known Member
calliandra said:
oh yeah, so true! the cheap COBs, they were hand-me-downs, just for getting a feel for LED ;)

And yes, I do agree, when you have a clearcut setup, definitely best to have just one quality driver (dimmable, haha there goes me looking for flexibility again :D ), and outside of that space of yours too!
If I ever get my new room built, I may switch to larger dimmable drivers, as I would like to experiment with lighting times and light intensities more than I can with the current config...
Why I always tend towards DIY, even if it's overwhelming sometimes - you can tailor and tweak solutions exactly to the rooms & growers needs :bigjoint:
Click to expand...

There might be a thread around here about the LED lighting ratio and intensity. The ratio that was most prominently used was 3:2:1 (R:B:W), while driving each separately the LED's could be "tuned" to the plant. You'll know you've got it right when the plant looks black in colour.
 
grapefruitmarmalade

grapefruitmarmalade

Well-Known Member
Enigma said:
There might be a thread around here about the LED lighting ratio and intensity. The ratio that was most prominently used was 3:2:1 (R:B:W), while driving each separately the LED's could be "tuned" to the plant. You'll know you've got it right when the plant looks black in colour.
Click to expand...
R:B:W = Red:Blue:White?
 
calliandra

calliandra

Well-Known Member
Enigma said:
There might be a thread around here about the LED lighting ratio and intensity. The ratio that was most prominently used was 3:2:1 (R:B:W), while driving each separately the LED's could be "tuned" to the plant. You'll know you've got it right when the plant looks black in colour.
Click to expand...
ohlol
nah, I'm for full spectrum with a nice curve and that's enough detail for me in that respect :bigjoint:

Now intensity, there's this concept of the daily light integral, which is a unit calculated from the total photon count that hits a m² per day and is used in greenhouse management. (cf. a paper from Purdue University, Commercial Greenhouse Production. Measuring Daily Light Integral in a Greenhouse, https://www.extension.purdue.edu/extmedia/HO/HO-238-W.pdf).
If we knew what the DLI for cannabis is, it would be a cinch to calculate how much light for how many hours.....
I think I need to revisit that document, my little runt is starting to grow, will stay in a small space throughout flower, and just got fed a green smoothie :-D
 
grapefruitmarmalade

grapefruitmarmalade

Well-Known Member
calliandra said:
ohlol
nah, I'm for full spectrum with a nice curve and that's enough detail for me in that respect :bigjoint:

Now intensity, there's this concept of the daily light integral, which is a unit calculated from the total photon count that hits a m² per day and is used in greenhouse management. (cf. a paper from Purdue University, Commercial Greenhouse Production. Measuring Daily Light Integral in a Greenhouse, https://www.extension.purdue.edu/extmedia/HO/HO-238-W.pdf).
If we knew what the DLI for cannabis is, it would be a cinch to calculate how much light for how many hours.....
I think I need to revisit that document, my little runt is starting to grow, will stay in a small space throughout flower, and just got fed a green smoothie :-D
Click to expand...
I've always wanted to get an Arduino and program my light intensity as sun rises/sun sets :bigjoint:
 
Enigma

Enigma

Well-Known Member
calliandra said:
ohlol
nah, I'm for full spectrum with a nice curve and that's enough detail for me in that respect :bigjoint:

Now intensity, there's this concept of the daily light integral, which is a unit calculated from the total photon count that hits a m² per day and is used in greenhouse management. (cf. a paper from Purdue University, Commercial Greenhouse Production. Measuring Daily Light Integral in a Greenhouse, https://www.extension.purdue.edu/extmedia/HO/HO-238-W.pdf).
If we knew what the DLI for cannabis is, it would be a cinch to calculate how much light for how many hours.....
I think I need to revisit that document, my little runt is starting to grow, will stay in a small space throughout flower, and just got fed a green smoothie :-D
Click to expand...
http://boards.cannabis.com/threads/building-led-lights-from-facts-no-theories.164607/

This is the first thread I've been able to find from knna. I don't know what happened to his previous work, but this is the beginning of the rabbit hole.

There are things that you'll realize when you further your understanding of how the plant operates. Which light spectrums are actually being used and which are being wasted on reflection, how much to feed, CO2 saturation, so on and so forth.

At this point, given what I know about LED, I cannot suggest the use of them for anything more than vegetative growth, clone rooting, small stealth flowering or supplemental lighting. The initial cost, build time and efficiency of LED arrays cannot compete with HID.

As far as those commercial units you find for sale, don't buy them.
 
grapefruitmarmalade

grapefruitmarmalade

Well-Known Member
Enigma said:
Correct. On average, green plants will use roughly a 3:2:1 ratio of light. There are peaks in the red and blue spectrum and a plateau in the white spectrum. Couple that with three individual adjustable drivers for each part of the spectrum and you will be able to "tune" your lights to your plants' needs.
Click to expand...
You're telling me I can have an LED array growlight depicting the American flag?
FUCK YEAH 'MURICA
 
Haze the maze

Haze the maze

Well-Known Member
horribleherk said:
My sour'diesel is still filling my room we're almost there & the gg#4 baby is getting roots View attachment 3945298View attachment 3945299
Click to expand...
Hey herk,
What's going on with your plant it looks like it is over watered but, it is in your DWC?
I saw this photo the other day and could not figure it out. Then it came to Me this morning...
You need more oxygen in your water. Them leafs need to be standing up!

IMG_0920.JPG

Peace:peace:
 
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