stardustsailor
Well-Known Member
And a lil' feast for the ears ....
[video=youtube;hVfYVNALIS0]http://www.youtube.com/watch?v=hVfYVNALIS0[/video]
[video=youtube;hVfYVNALIS0]http://www.youtube.com/watch?v=hVfYVNALIS0[/video]
Well...Interesting sds. Tri phosphor huh? Read a bit about it, seems like a newer tech utilizing uv leds as a base. Available?
Interesting sds. Tri phosphor huh? Read a bit about it, seems like a newer tech utilizing uv leds as a base. Available?
Overall, PPF better predicted the photosynthetic efficiency
of each light source than YPF.
conclusion:Our results indicate that YPF is poorly correlated with photosynthetic efficiency
(Fig. 8A). Furthermore, addition of green light to a red and blue light source at a
constant PPF increased growth as light intensity increased
yellowish hps? umols, umols, umols, its only size that mattersIn the 'older days' ...
I remember some people ,
mentioning the -almost monochromatic yellow- LPS light bulbs ,
as the 'ultimate' added "flowering boost" light
The good results from growing only with simple 3000K WW leds ..
A blue and a yellow peak ...
can you link to the buck you're using?yes i think they use UV chips or 460nm blue and 660nm red underneath the phosphor layer, i have the 100w version, basically white light with pink infused, vegged as good as anything else i have tried, the question of can it flower effectively i will find out in about 4-weeks and update you all as a matter of importance. but at £30+free shipping it was a steal, i power it via buck boost and laptop power supplies which as you know are cheap as chips on ebay, precision constant current and voltage is better than single constant current driver, no variatons and i can dim it accordingly. i drive it at 93w and the heatsink is "arctic alpine 11 plus" CPU cooler, does a fine job of keeping chip cool EVEN AT NEAR FULL POWER. with a total of just over £40 for 100 actual watts its a bargain, i often spend £40 just on taking the kids to cinema or swimming so it basically sells itself. fingers crossed for dense buds, i previous;y used 150w HPS, and ive been told this chip should compete with that, not sure as 150w sodium can go far with our beloved plant..
best regards..lewis m..
Leaf Functional Anatomy in Relation to Photosynthesis ...For efficient use of the light energy, light needs to be delivered to all the chloroplasts distributed along the cell surfaces throughout the leaf. Leaves, therefore, have to fulfill two contrasting requirements: to absorb much light, and to deliver light to all the chloroplasts. Red and blue light is largely absorbed by chloroplasts located near the illuminated surface of the leaf, because chlorophylls preferentially absorb these wavelengths. Light penetrating deeper inside the leaf is mostly green. Chlorophylls are less efficient in absorbing green light. However, multiple scattering increases the path length of light such that leaves absorb 80% of the green light incident on the leaves... |
Green Light Drives Leaf Photosynthesis More Efficiently than Red Light in Strong White Light: Revisiting the Enigmatic Question of Why Leaves are Green ...However, many spectra of absorptance (the absolute value of light absorption) measured with integrating spheres have shown clearly that ordinary, green leaves of land plants absorb a substantial fraction of green light (McCree 1972, Inada 1976, Gates 1980). It is also known that green light, once absorbed by the leaves, drives photosynthesis with high efficiency (Björkmann 1968, Balegh and Biddulph 1970, McCree 1972, Inada 1976). On an absorbed quantum basis, the efficiency or photosynthetic quantum yield of green light is comparable with that of red light, and greater than that of blue light. The difference between the quantum yields of green and blue light is particularly large in woody plants grown outdoors in high light. .. ..Namely, red light is more effective than green light in white light at low PPFDs, but as PPFD increases, light energy absorbed by the uppermost chloroplasts tends to be dissipated as heat, while penetrating green light increases photosynthesis by exciting chloroplasts located deep in the mesophyll. Thus, for leaves, it could be adaptive to use chlorophylls as photosynthetic pigments, because, by having chlorophyll with a ‘green window’ the leaves are able to maintain high quantum yields for the whole leaf in both weak and strong light conditions. |
So would this mean that all these Green-gaps you often see in LEDs might actually be a bad thing? If so, then this really speaks well for the full-spectrum camp.
Green Light Drives Leaf Photosynthesis More Efficiently than Red Light in Strong White Light: Revisiting the Enigmatic Question of Why Leaves are Green
...However, many spectra of absorptance (the absolute value of light absorption) measured with integrating spheres have shown clearly that ordinary, green leaves of land plants absorb a substantial fraction of green light (McCree 1972, Inada 1976, Gates 1980). It is also known that green light, once absorbed by the leaves, drives photosynthesis with high efficiency (Björkmann 1968, Balegh and Biddulph 1970, McCree 1972, Inada 1976). On an absorbed quantum basis, the efficiency or photosynthetic quantum yield of green light is comparable with that of red light, and greater than that of blue light. The difference between the quantum yields of green and blue light is particularly large in woody plants grown outdoors in high light. ..
..Namely, red light is more effective than green light in white light at low PPFDs, but as PPFD increases, light energy absorbed by the uppermost chloroplasts tends to be dissipated as heat, while penetrating green light increases photosynthesis by exciting chloroplasts located deep in the mesophyll. Thus, for leaves, it could be adaptive to use chlorophylls as photosynthetic pigments, because, by having chlorophyll with a ‘green window’ the leaves are able to maintain high quantum yields for the whole leaf in both weak and strong light conditions.
The following is a simple colour wheel from wikipedia. These are complementary colours, opposites "fit" together.Some thoughts about yellow light...
Something has to be there ...
Don't know what,though...
Firstly,there are a lot of 'indications' ...
The HPS ...The flowers being made ,under loads of it's yellow light ...
In the 'older days' ...
I remember some people ,
mentioning the -almost monochromatic yellow- LPS light bulbs ,
as the 'ultimate' added "flowering boost" light .
The good results from growing only with simple 3000K WW leds ..
A blue and a yellow peak ...
Secondly,the yellow light ,the insects and the flowering mechanisms of plants ...
There has to be a connection ..
Only ..I just can't figure it out ...
Something is there ...
But then again...
I'm "saganizing " ...
Weird thing though..
The plants use the part of E/M radiation ,that our vision can sense as 'light' ...
More or less ... 400-700 we see ,~360-730 the plants need/use...
So..The insects can't just have been 'left out' from the 'equation' ,can they ?
Every wavelength,every 'color' play it's role,somehow...
We can't 'flourish' in a black 'n' white world..
Plant's can't either in a red'n' blue world ..
Now,that was poetic,wasn't it ?
Good sh!t the ledborne ...
The following is a simple colour wheel from wikipedia. These are complementary colours, opposites "fit" together.
View attachment 3011405View attachment 3011405
The pure yellow that you mention happens to fall in the lowest spectrum that cannabis (and some basil and some lettuces) leaves can be seen. I guess yellow is also usable by the plant, it's just not a center-stage requirement and more of a healthy addition to the plants photosynthesis needs.
IDK, I just wanted to pimp the colour wheel because I found it important earlier today.
i figured that