조명은 조명일 뿐, 식물이 필요로하는 파장을 공급해 주는 것이 중요합니다.

 

일반적으로, 적색과 청색을 90:10 으로 하면 광합성에 가장 효율적이라고 합니다. -> 전기에너지 효율이 아님.

 

그런데, 이것만가지고 되는 것은 아니구요, 식물은 , 녹색, 청록색, UVA [Near UV] 등도 필요하다고 합니다.

 

아래는 참고 문헌입니다.

 

 

EFFECT OF SHORT-WAVELENGTH LIGHT ON PLANT PHYSIOLOGY
 
Light  is one of  the most  important  environmental  factors,  acting  on plants not only  as  the
sole  source  of  energy,  but  also  as  the  source  of  external  information,  affecting  their  growth  and
development. Plants are empowered with an array of photoreceptors controlling diverse responses to
light parameters,  such as  spectrum,  intensity, direction, duration etc. These photoreceptors  include
the  red  and  far-red-absorbing  phytochromes,  the  blue  and UV-A  light  absorbing  cryptochromes,
phototropins,  and  other  implied  photoreceptors,  absorbing  in  UV-A  and  green  regions.  Spectral
changes  of  illumination  evoke  different morphogenetic  and  photosynthetic  responses,  which  can
vary among different plant species. 
 
What is the good of it?
The  photoresponse  is  of  importance  in  agrotechnology,  since  feasibility  of  tailoring
illumination  spectra  enables  one  to  control  plant  growth,  development,  and  nutritional  quality.
optimization of  lighting  system  is of  especial  importance  for plant  cultivation  in greenhouses  and
phytotrons. First of all, suitably selected lighting spectrum  ensures normal plant growth. Moreover,
using purposefully designed  lighting  spectrum enables one  to  regulate  flowering  time,  the balance
between growth and development processes, biomass accumulation, stem elongation, and to impact
plant primary and secondary metabolism, directly associated with the food quality of vegetables. 
 
How to employ the light?
It is generally accepted, that optimal plant illumination spectrum should contain 90% of red
light  component  and  10%  of  blue  component.  Meanwhile,  plants  representing  different  life
strategies  and  different  life  forms  require  different  lighting  conditions.  The  conventional  high
pressure sodium lamps have the highest intensity in red/orange spectral region. Such light, affecting
phytochrome  reversibility,  is  the  most  important  for  photosynthesis,  flowering  and  fruiting
regulation.  Nevertheless,  the  other  spectral  components  can  also  be  employed  when  seeking  for
desired  effect. The  recent  progress  in  solid-state  lighting,  based  on  light-emitting  diodes  (LEDs),
facilitated and expanded  the  research  in  this  field and created  an outset  for new progressive plant
cultivation  technologies.  Thus,  what  about  other  light  colors?  What  is  the  influence  of  shortwavelength
  light? Therefore, our  joint  research  supported by EU-Asia Link project ENLIGHTEN
was  aimed  at  study  of  the  effect  of  supplemental  short-wavelength  light  on  plant  growth  and
development.  

 

 

The blue light
  Blue light  is favorable for growth of many plants, including  lettuce, spinach, wheat, radish
and  other.  It  affects  the  chlorophyll  formation;  photosynthesis  processes,  stomata  opening,  and
through  cryptochrome  and  phytochrome  system  raises  the  photomorphogenetic  response.  In  our
study, we  observed  that  the blue  light  (450 nm)  promotes dry matter production  and  inhibits  cell
elongation in stems and leaves. The optimal flux of blue light for leafy plants is about 10-15% of the
total photosyntheticaly active radiation. Moreover, the higher flux of blue light is essential for radish 
(for  normal  carbohydrate metabolism  and  photosynthetic  assimilate  transport  from  leaves  to  the
storage organs, thus assuring tuber formation). Also it has a slight effect on primary and secondary
metabolite synthesis, indicating light-dependent metabolism. 
 
 
The green light
Plants  are  green  because  they  reflect  light  in  this  spectral  region;  the  green  light  is more
efficiently transmitted through the plant body and acts as a signal to tissues not directly exposed to
the  light  environment. Therefore,  the  supplemental  green  light  enhances  biomass  accumulation  in
the  above-ground  part  of  the  plants,  and  also  affects  chlorophyll  and  carotenoid  synthesis,  thus
improving  the  color  of  leaves.  Phytochromes,  principally  thought  of  as  red/far-red  reversible
pigments, are extremely  sensitive  to  the entire  illumination  spectrum  and even  small variations  in
the spectrum initiates responses in the phytochrome system. 
 
The cyan light
There are no solid scientific evidences on the effect of the cyan light on plants. However, it
is possible, that cyan light, being close to the green region, has the same positive biological effect.
According  to  our  results,  supplemental  lighting  with  cyan  light  emitting  diodes  (505  nm)
significantly  affected  carbohydrate  and nitrate metabolism  in  lettuce  and  slightly  improved  radish
growth. 
 
The near UV light
Though overexposure to UV light is dangerous for the flora, small amounts of near-UV light
can have beneficial effects. In many cases, UV-light is a very important contributor for plant colors,
tastes and aromas. This is an indication of near-UV light effect on metabolic processes. According
to our results, the UV light (385 nm) promotes the accumulation of phenolic compounds, enhances
antioxidant activity of plant extracts, but do not have any significant effect on growth processes. 

 

References: 
 
·  Devlin P.F., Christie J.M., Terry M.J. Many hands make light work // Journal of Experimental Botany. 2007.
Vol. 58. P. 3071-3077.
·  Drozdova   I .   S. ,   Bondar   V.   V. ,   Bukhov N.   G. ,  Kotov A.   A. ,  Kotova  L.  M. ,  Maevskaya   S. 
N. ,   Mokronosov  A.   T.   Effects  of  light  spectral  quality  on morphogenesis  and  source-sink  relations  in
radish plants // Russian journal of plant physiology. 2001. Vol. 48. P. 415-420. 
·  Fol ta K.  M. ,  Maruhnich S.  A.  Green light: a signal to slow down or stop // Journal of Experimental
Botany. 2007. Vol. 58. P.3099-3111.
·  Frankl in K.  A. ,  Whi telam G.  C.  Light signals, phytochromes and cross-talk with other environmental
cues // Journal of experimental botany. 2004. Vol. 55. P. 271-276. 
·  Kim H.H. ,  Goins  G.D. ,  Wheeler  R.M. ,   Sager   J .C.  Green-light supplementation for enhances lettuce
growth under red- and blue- light-emitting diodes // HortScience. 2004. Vol.39. P.1617-1622.
·  Mat suda R. ,  Ohashi -Kaneko K. ,  Fuj iwar a K. ,  Goto E. ,  Kurata K.  Photosynthetic Characteristics
of Rice Leaves Grown under Red Light with or without Supplemental Blue Light // Plant Cell Physiol. 2004.
Vol. 45. P. 1870-1874.
·  Spalding,  E.P. ,  Fol ta,  K.M.  Illuminating topics in plant photobiology // Plant Cell Environ. 2005. Vol.28.
P. 39-53.
·  Yor io  N.C. ,   Goins   G.D. ,   Kagie  H.R. ,  Wheeler   R.M. ,   Sager   J .C.  Improving spinach, radish and
letuuce growth under  red  light emitting diodes  (LEDs) with blue light supplementation // HortScience. 2001.
Vol.36. P.380-383.

 

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파장의 특정 식물에 영향을 간단히 정리한 다른 자료입니다. 사전을 찾아보니 작물이 대마네요...제가 키우거나 실험한 것 아닙니다. ㅎㅎㅎ

 

200 - 280 nm	UVC ultraviolet range which is extremely harmful to cannabis plants because it is highly toxic.
280 - 315 nm	Includes harmful UVB ultraviolet light which causes cannabis plants colors to fade.
315 - 380 nm	Range of UVA ultraviolet light which is neither harmful nor beneficial to cannabis plant growth.
380 - 400 nm	Start of visible light spectrum. Process of chlorophyll absorption begins. UV protected plastics ideally block out any light below this range.
400 - 520 nm	This range includes violet, blue, and green bands. Peak absorption by chlorophyll occurs, and a strong influence on photosynthesis. (promotes vegetative growth)
520 - 610 nm	This range includes the green, yellow, and orange bands and has less absorption by pigments.
610 - 720 nm	This is the red band. Large amount of absorption by chlorophyll occurs, and most significant influence on photosynthesis. (promotes flowering and budding)
720 - 1000 nm	There is little absorption by chlorophyll here. Flowering and germination is influenced. At the high end of the band is infrared, which is heat.