Photosynthesis Under Solid State Light. Setting the Standards .

Randomblame

Randomblame

Well-Known Member
Good question!
For me the sylvania tools is too complex!
For me would be enough to know how many red 3watters(630+670nm) I need for a useful Vero29/CXB3070/3590 supplement! Is 3w (2x 630nm) and 7w (5x 670nm) enough to optimize a white 50w cob(4k/5k)?
 
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Michael Huntherz

Michael Huntherz

Well-Known Member
This is going to require a little digestion to grok, but I grabbed the Sylvania tool, and I'm super-stoked. My kind of thread, everyone, I'm learning a crap-ton of stuff right now. The Shizz; is what this site is.
 
OneHitDone

OneHitDone

Well-Known Member
bicit said:
The photons will hit eventually amd be nice and mixed. Its just a slight tweak in the grand scheme of things.
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I don't have the knowledge or technicality to argue this from a scientific stance but something just doesn't seem right to me.
Say you have a 1000w HPS 30" above your plants and then you mount a 6500K 23w CFL to the 8' high ceiling of the room.
Yes, somewhere in there the blue cfl is blending with the HPS light but is it truly contributing anything to photosynthesis with intensity that low at the canopy?
 
P

PurpleBuz

Well-Known Member
OneHitDone said:
I don't have the knowledge or technicality to argue this from a scientific stance but something just doesn't seem right to me.
Say you have a 1000w HPS 30" above your plants and then you mount a 6500K 23w CFL to the 8' high ceiling of the room.
Yes, somewhere in there the blue cfl is blending with the HPS light but is it truly contributing anything to photosynthesis with intensity that low at the canopy?
Click to expand...
23w cfl versus 1000w hps, probably not much difference. but if you use a more reasonable wattage ratio and a better blue source , like 100w of luxeon royal blue monos + UVA leds it will make a notable difference in the quality of the flowers, and will increase the efficiency a little bit.

You can do the same comparison by supplementing Vero 29 3K temp with a bit of royal blues+UVA leds.
 
bicit

bicit

Well-Known Member
OneHitDone said:
I don't have the knowledge or technicality to argue this from a scientific stance but something just doesn't seem right to me.
Say you have a 1000w HPS 30" above your plants and then you mount a 6500K 23w CFL to the 8' high ceiling of the room.
Yes, somewhere in there the blue cfl is blending with the HPS light but is it truly contributing anything to photosynthesis with intensity that low at the canopy?
Click to expand...
Yes, the photons from the CFL are intermingling with the photons with the photons emitted by the 1000w hps in your example. However when you consider the difference in power displacement, efficiency difference (~18% to ~40% respectively), and the quality of the reflector, it's not going to do jack. If you will imagine a sandy desert, the grains of sand representing the photons emitted by a hps. Adding that CFL would be the equivalent to dumping about a pound of sprinkles in said desert. After a few days you won't even notice the difference. Now, come in with a few dump truck of sprinkles, it'll make a huge difference.

Does that make sense?
 
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OneHitDone

OneHitDone

Well-Known Member
bicit said:
Yes, the photons from the CFL are intermingling with the photons with the photons emitted by the 1000w hps in your example. However when you consider the difference in power displacement, efficiency difference (~18% to ~40% respectively), and the quality of the reflector, it's not going to do jack. If you will imagine a sandy desert, the grains of sand representing the photons emitted by a hps. Adding that CFL would be the equivalent to dumping about a pound of sprinkles in said desert. After a few days you won't even notice the difference. Now, come in with a few dump truck of sprinkles, it'll make a huge difference.

Does that make sense?
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Yes, but brings us back to I guess the term would be photon intensity? How do we know from one source to the next the intensity in a specific spectrum?
I see that hortilux uses Watts as a measure of intensity, but that seems inaccurate if we are wanting to know say - how many photons in the 660nm range?
See what I am asking?
 
bicit

bicit

Well-Known Member
OneHitDone said:
Yes, but brings us back to I guess the term would be photon intensity? How do we know from one source to the next the intensity in a specific spectrum?
I see that hortilux uses Watts as a measure of intensity, but that seems inaccurate if we are wanting to know say - how many photons in the 660nm range?
See what I am asking?
Click to expand...
A spectroradiometer, how it works is not my area of expertise. It can measure the relative intensities of each wavelength. As to how much of what and when is still a much heated topic of debate. 'it depends' is the only conclusive answer.
 
salmonetin

salmonetin

Well-Known Member
...or the hard way... ...plotted values from her SPD graph (using a graphic plotter software)... and use a kanna spreadsheet...or similar...

...sorry my bad english...

...off course the measures in situ are better... but an SPD graph its more usual...

...the question is... we can trust in the SPD graph for the actual vero o cree cobs? ...are there SPD graphs for all bins or ºK?...;)

:peace:

saludos
 
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bicit

bicit

Well-Known Member
The decor series is great at causing common herbs to bolt. Could be good or bad depending on what you want.

For human vision for some odd reason I love the appearance of a 2700k, 97cri emitter, with a pair of 4000k 80 cri emitters on either side of it all. It adds a certain 'gleam' to glass ware that I find memorizing.
 
Greengenes707

Greengenes707

Well-Known Member
captainmorgan said:
Just checked the data sheet for a 3590 I'm looking to buy,top bin 80 CRI is 12000 lumen,top bin 92 CRI is 10000 lumen for the same 3500k,that's 17% less output.
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It's a tough one. bins don't tell you what you want to know. Efficacy/LER does. And their LERs are not the same. 325 for80cri and around 275 for 90cri.

The biggest issue was photon output. But with the cxb...high cri got an extra bin bump from the CXA. IF we could get top bin cxb's...they would be welcomed by me at least.

The only thing we have a hunch about is stretch from the added deep red. But nothing set into stone on high cri and physiological growth.

If going high cri...I suggest high K temps.
 
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