The Ideal spectrum.

[FORTUNECOOKIES]

Ordered the MQ-620

Waste of money that could have been spent on a proper spectrometer. You will see how bad it is once you use it with an incandescent

 

[hybridway2]

i'm super glad you've worked that one out, mate. What's next? i canny wait.

I just don't understand how one person can judge everybody else's growing based on their EC/PPM's when we a have different size plants & nutrient profiles.
Hearing this many places lead me to state the obvious is all. You pokin fun?

 

[hybridway2]

Waste of money that could have been spent on a proper spectrometer. You will see how bad it is once you use it with an incandescent

Yeah they say made to use with led prob cuz the real ir is over weighted. But for measuring today's led tech it should do well.
Do want a nice spectrometer though too. Maybe next time. The Par-Meter has more immediate uses.

 

[FORTUNECOOKIES]

Yeah they day use with led prob cuz the real ir is over weighted. But for measuring today's led tech it should do well.
Do want a nice spectrometer though too. Maybe next time. The Par-Meter has more immediate uses.

You should really learn about how PAR is calculated so you understand why that PAR meter is rubbish. Math is important

 

[hybridway2]

You should really learn about how PAR is calculated so you understand why that PAR meter is rubbish. Math is important

Pm me & teach me then. Or link me if not to much trouble. Thnx!
It will measure the difference between white, in that range & that with 730+ & -380nm.
After all, what's a quap for the newest par-meter?

 

[FORTUNECOOKIES]

Pm me & teach me then. Or link me if not to much trouble. Thnx!
It will measure the difference between white, in that range & that with 730+ & -380nm.
After all, what's a quap for the newest par-meter?

Math behind

Someone suggested that it would be useful to have a thread covering some math behind all those (not only) LED calculations. So I'll start with explaining what luminous efficacy of radiation and quantum efficacy (?) of radiation are and how they can be calculated from a "spectrum curve"...

www.rollitup.org

 

[end_of_the_tunnel]

You should really learn about how PAR is calculated so you understand why that PAR meter is rubbish. Math is important

Whilst this thread is for discussing spectrum, using a PAR photon sensor is perfectly acceptable for measuring PPFD.
What would be nice, is someone with a spectrometer and calibrated deuterium and halogen light sources to come into this thread, and offer help and assistance. Sadly, I don't believe anyone that has posted has such resources or expertise to offer.

What is the ideal spectrum for flowering? Cruising the threads, its easy to see that plain jane unmolested white leds from a range of kelvin temps and CRI's will produce.
Does added red/deep red and far red really improve the situation? I see some beautiful grow examples done.
Clearly the ideal is a lamp with adjustable range of spectral output. Or is it? Would it have true utility?
Then factor in the person tending to the plants, and their expectations according to the environment they are accustomed to. Traditional tents and rooms, or dense organic SOG racks spaced on 70cm. Ideal spectrum? Clearly its down to what and how you grow.

 

[lukio]

You pokin fun?

i wouldnt do that, Hybrid. A man with your background and experience needs to be taken extremely seriously. Ive been wondering for ages what the numbers on the my meter mean, i should of just asked...doh!

 

[lukio]

SOG racks spaced

nice

 

[end_of_the_tunnel]

nice

Perfume city.

 

[jarvild]

I seriously doubt I'll ever own a par meter considering I have the best subjects for testing, like the plants themselves.
@hybridway2 side by sides are a moot point for me anymore, just as checking pH is moot for me also growing in coco or soil, I haven't broken out my pH meter in months, Heck 10 yrs ago I was using well water that came out at 400 ppm and a pH of 8.5, with almost 300 ppm of that being cal-carbonate, I grew for years like that with never being able to get my feed pH below 7.5.
It's a plant, there is nothing special about how it grows.

 

[sethimus]

i'm super glad you've worked that one out, mate. What's next? i canny wait.

plants receive no photons when the lights are out

 

[lukio]

plants receive no photons when the lights are out

Use Amare, their super special canna spec (patent pending) grows elves that paint the leaves in this special film that forces the plant to grow in the dark. According to Victor "buds grown in the dark have most bag appealz"

 

[hybridway2]

Damn right my plants grow in the dark. Quite a bit too.

 

[Kassiopeija]

my plants grow in the dark.

my plants smell in the dark and I know by experience its sometimes around 1 or 2 hours when this becomes apparent when the carbonfiltervent is off. it also seems that 730nm light can trigger this and doesnt have negative effect on plants when used as nightlight.

 

[Kassiopeija]

So what conclusions came out of the discussion about the "Ideal Spectrum"? What results were objectified in the field research to amend the generell spectrum with penetrating green, orange, farred, or UV & IR? Is the cost of hardware or electricity to high to being able to imitate the sun? Or are having this the MH & HPS combo growers for free and the LED only stumbles like a child...

But with regards to plant physiology and absorptions spectra of pigments, photoreceptors & leaf surface material we can identify a number of individual wavelength which seems important and highly effective in the growth of cannabis:
- 280nm
- 365nm
- 385nm
- 400nm
- 425nm
- 440nm
- 460nm
- 490nm
- 550nm
- 630nm
- 660nm
- 680nm
- 730nm
(- 850nm)
(- 940nm)

We know that all of these wavelengths have different effects on the buildpattern, hormone level, photosynthesis done, metabolism, or other environmental factors and can be elligible to increase either quality or quantity.

Recently, our agents have acquired a secret blueprint of an experimental artificial sunspectrum:

We also gained precise hardware knowledge about the UVC/UVB-complex, but reports of the remaining wavelengths are still missings...

We must conduct more field research into infrared & leaf surface temps, penetrating spectrum color addition such as green, orange, more & equal blue stimulation. A spectrum that is designed to not exert full PS thrust at the first topleave but instead at the first 1-5 leaves and therefore this spectrum could be run at a higher photon flux density - just like the sun has more than 1700 umols.

 

[nachooo]

We must conduct more field research into infrared & leaf surface temps, penetrating spectrum color addition such as green, orange, more & equal blue stimulation. A spectrum that is designed to not exert full PS thrust at the first topleave but instead at the first 1-5 leaves and therefore this spectrum could be run at a higher photon flux density - just like the sun has more than 1700 umols.

This is the key : more wavelenghts below 450 and more wavelenghts that allow better penetration of light into the intracanopy. And the role of Far red and infrared in leaf transpiration...

 

[Horselover fat]

^You don't need better spectrum to penetrate canopy - you need diffuse light from high above.

 

[nachooo]

^You don't need better spectrum to penetrate canopy - you need diffuse light from high above.

Certain wavelenghts like those on the green zone penetrate deeper into canopy also far red . That is a scientific fact well know since time ago
By the way , your nick comes from Philip K.dick novels?

 

[nachooo]

Wind or air movement allow light rays also to penetrate when leaves are moved by the air..this effect is well studied in photobiology also...
You can have lot of diffuse light as top lighting source but if you have a very dense top canopy layer...it wont penetrate too much