Which color of light affects the height of plants?
813056
During  a recent experiment our finding with red, green, blue, yellow and clear lights were as follows:\n\nOur results show that the red group grew the most in height, and the yellow and green groups exhibited similar amounts of growth. The blue group grew the least of the colored groups, but the clear and control groups grew the least of all the groups.
134329
Leaves look green because they reflect green light. So at this, and nearby, wavelengths very little light energy is used to synthesise sugars (& starch).\nThe most effective wavelengths are therefore at the 'red end' of the spectrum or the 'blue end'. As it happens it is light at the 'red end' that is most important.\n\nThis info. would make a nice line graph - you could look up either absorption spectrum or action spectrum to get a precise answer for your question.
731841
I am highly skeptical of this notion.  However, they affect the moisture content of the air through the transfer of moisture into/out of leaves through holes on the underside called stoma.  Maybe they were referring to heat caused by light shining on the leaves.  This heat would result from absorbance of light.  This heat would radiate off the plant into the air and would warm the air around the plant.  That's all I can hypothesize.
158641
If you are asking about light (beams of) then the answer is white.  A prism separates a beam of light into its component parts, producing a "rainbow".  Natural sunlight near mid-day is considered white light.  Sunlight reflected from a white surface likewise can be refracted into a rainbow spectrum because that surface is reflecting all colors of the spectrum.\n\nIf you are talking about pigments, then the combination of all colors is a dark, muddy mess of indeterminate color.
288720
Vegetation emits in the infrared wavelength.  On false-color infrared mosaics, vegetation appears in red instead of green. The "redness" indicates vegetation density, type and whether growing on dry land or in a swamp. Grasslands appear light red, deciduous trees and croplands appear red, and coniferous forests appear dark red or maroon. Desert areas appear white and urban areas appear bluish green. Lakes, rivers and oceans appear in various shades of blue, dark blue for deep water and light blue for shallow or turbid water
901813
Predominantly red and blue - there are peaks at these ends on the absorption spectrum:(http://www.mbari.org/staff/ryjo/cosmos/Cabs.html)\nBasically, they DON'T use much green - it is reflected back, so is what is seen by your eyes - hence green plants appear green!\nThe main pigments in green plants are chlorophyll-a and chlorophyll-b (which absorb light at those particular wavelengths/colours shown in the diagram) but there are also other pigments used in plants and algae.\n\n-Tara mentioned photosystems - yup, there are 2 photosystems used in the light reactions of photosynthesis - the light energy is absorbed by the pigments in the 'antenna complex' of PSII, which then transfer this energy toward the centre Chl-a molecule ("reaction centre chlorophyll") of that photosystem, exciting an electron which is passed down an 'electron transport chain' to PSI, etc... (if you don't need to know it yet, it's sounds like a scary long process!) - but although I believe the reaction centre chlorophylls may absorb light best only at the red end, there are other pigments in the photosystems which would be absorbing at the blue end as well I should think - blue light is higher energy (shorter wavelength) than red light, so this higher energy light would be absorbed by pigments nearer the edges of the antenna complex, and as the light is transferred through to the reaction centre chlorophyll it would lose energy in the process, and thus probably more toward the red end of the spectrum by the time it arrives. http://en.wikipedia.org/wiki/Photosystem
1104794
No.  Plants don't absorb much UV.  Grow lights are designed to emit light in the wavelengths that plants absorb, so get a grow light.\n\nWhat does the visible spectrum have to do with plants?\nPlants must have light to grow and survive in their environment. The plants specifically use light to make their food in a process called photosynthesis. The light is absorbed by the green pigment chlorophyll, which is located in the leaves of the plant. The actual colors in the visible spectrum that the plant absorbs and uses for photosynthesis are red and blue. The plant reflects green light, and that is what we see when we look at a green plant. Green light is not the only reflected light. For instance, far-red light is also reflected. Far-red is just outside the visible light spectrum. It is not visible to the human eye, but can be sensed by the plant. Far-red wavelengths are important to the plant because of the competition factor in nature. A plant can "SEE" when there are other plants close by because of the increase of far-red wavelengths the other plants reflect. This will then signal the plant to make the necessary adjustments within their system to try to outgrow the others around them since they are competing for sunlight and other resources.\n\nhttp://www.florence.ars.usda.gov/kidsonly/middle/mulch3.html
734392
Depends on the plant. Some plants grow faster than others.
778920
different types of chlorophyls are composed of different pigments which absorb different wavelengths of light (different colors in the spectrum)
466674
Plants cannot change color in and of themselves.  What could happen, though, is that one plant could be pollinated by a neighboring plant and it would produce seed that contained some of the characteristics of both plants.
443022
Various plants have different accessory pigments in addition to chlorophyll.These various pigments are more efficient at using different wavelengths or under low or bright light conditions. For instance, many rain forest plants that live on the forest floor have a reddish undercoating to trap certain wavelengths of light. So, the various colors are adaptations to handle different growing conditions and allow the plant to grow adequately in areas where other plants cannot grow well.
85611
The sunlight at sunset and sunrise is considerably more orange and/or red than it is when the sunlight is directly overhead. This is because the sunlight has passed through more air, which contains nitrogen and oxygen molecules. These molecules are the right size to scatter away the short wavelengths of the sunlight (the blue end of the spectrum), leaving the long wavelength, red light. This is known as Rayleight-Tyndall scattering. If there are a lot of dust particles or water droplets in the air, these are considerably larger than the nitrogen and oxygen molecules, and they will reflect the red and orange colors of the sunlight, making the sunrises and sunsets more red.
283817
It has a and b.  C is only present in certain types of algae.\n\nNatural light generally works the best but if you don't have enough, try using a grow light.
84822
Every plant is biologically programmed to thrive and flourish under certain lighting  conditions...  some need lots of light, and some don't.
507622
Chlorophyll. It needs the presence of sunlight too.
55652
light density or intensity? if you're talking about intensity then it depends on distance. that's an inverse square relationship.
801568
I did an experiment with this in graduate school.  When a plant has limited to no light, it invests all of its energy and growth into finding a light source.  In my experiment, the plant grew very tall and had very few leaves (since it could not go through photosynthesis anyway, why bother).  It was a very interested experiment and proved that even plant have priorities.