I have a technical question on led technology. I would like to know what led chip manufacturers like Samsung do to make the led work for photosynthesis.
Do they apply a filter or do they play with the color, the wavelength?
What I would like to know is if I take several strips of LEDs of different color (K) and install them side by side as in the photo, is this suitable for making seedlings?
Or do we have to have a chip really made for it?
THANKS
I have a technical question on led technology. I would like to know what led chip manufacturers like Samsung do to make the led work for photosynthesis.
Do they apply a filter or do they play with the color, the wavelength?
What I would like to know is if I take several strips of LEDs of different color (K) and install them side by side as in the photo, is this suitable for making seedlings?
Or do we have to have a chip really made for it?
THANKS
The Phosphor Converted White LEDs made by Samsung, Cree, Philips, Osram, etc all provide broad spectrum light that's adequate for plant growth and typical for all similar Phosphor Converted White LED's.
... https://www.biorxiv.org/content/10.1101 ... 1.full.pdf
1... For "Grow Light" Applications 5000K, 4000K, 3000K, etc. (Correlated Color Temperature - CCT) are a reference for the (Relative) Percentage of Blue - Green - Red - Far Red Wavelengths (% B-G-R-FR) in a Phosphor Converted White LED Light Spectrum.
2... The percentages for actual "LED Grow Lights" can and will vary based on;
a. Phosphors used in the Phosphor Converted (PC) White LEDs (Manufacturer, CRI, etc) and or
b. Any mixed or added supplemental mono (discrete 380 - 750nm) wavelengths.
c. Added excess 660nm LEDs for increased electrical efficacy (to increase PPF/W or PPF/J)
3... Academic Horticultural Research has shown plant species specific optimal growth for PAR (400 - 700nm), Photosynthetic Efficiency (not Electrical Efficiency) occurs with;
~ 10 - 25% Blue,
~ 25% Green and
~ 50 - 65% Red / FarRed.
4... The Research has also shown (in general) for supplemental wavelengths outside of the 400 - 700nm PAR spectrum;
a. UV 320 - 399nm (and increased 400 - 500nm Blue wavelengths) actually retards vegetative plant growth but can be beneficial when applied before harvest to increase phyto-chemicals.
b. FarRed 700 - 780nm is beneficial for increased Photosynthesis, small percentage creates synergistic reactions with 600 - 699nm Red wavelengths.
c. Infra-Red, 800 nm and above has no direct benefits to photosynthesis, just produces heat.
Taking this opportunity, I would like to ask about whether it is possible to use smart light bulbs for the same purposes? I plan to order them using a special website https://www.vont.com/product/vont-bulb- ... mart-bulbs /. I am almost sure that such a possibility is acceptable, but I would like to hear the advice of professionals. I like the fact that it is possible to remotely adjust the degree of illumination in the greenhouse for certain needs. That's why I have such a great desire to install them.
