Joined: Oct 04, 2008 Posts: 537 Location: Bangalore
Posted: Tue Feb 24, 2009 6:51 pm Post subject: Re: Best light for red plants
Mr. Madan, thank you for the clarification. I was however wondering about the redness in plants...
Why are only some plants red and the neighbouring plants green, if it is only a reaction to light. I understand their requirement levels are different like any other living being, but is there something like red chlorophyll (I have no clue on this subject, please excuse the dumb question) which causes the plants to turn red, and some of them more than the others.
This topic is very interesting to me especially because I love red plants.
@Madhu and Sandeep, all the time I was talking about the penetration of light in water only and not in air, where the case is completely different as explained by Mr. Madan above (and of which I had no idea).
Joined: Aug 10, 2004 Posts: 881 Location: New Delhi-India
Posted: Mon Apr 20, 2009 6:33 pm Post subject: Re: Best light for red plants
Red Pigmentation is caused by Flavenoids, which protect the plants from the damaging effect of ultra violet light
Plants produced more of this chemical in sunshine than underwater. The red colour was there to protect them from the bright light and specifically from ultra violet light.
Flavonoids are phenolic compounds used by plants as visual and olfactory attractants. Anthocyanins are flavonoids that are the source of most red, pink, purple, and blue colors in plant parts, including the many red varieties of Echinodorus and Cryptocorynes.
The epidermis of the leaves of all plants contains flavonoids that protect against UV-B radiation (280-320 nm). These compounds absorb light in the UV-B range but allow visible light to pass through uninterrupted for photosynthesis.
Effectively these red plants which are using all their energy to produce flavenoids to protect themselves rather than grow vigorously.
Many believed that red plants needed extra light as the red pigment blocked the green pigment and prevented chlorophyll from being produced and therefore extra light was necessary.
Plants will grow quite happily in daylight and any good white light although they will stay - or revert to -green.
That is why lot of these plants turn Green under the Light that we use, so the best light for these plants will be those lamps that also have a component if UV-B radiation in them ....
A good lamp would be one which has a good intensity of UV-Blue and Blue and if you have green plants mix and match with a full spectrum light as well.
For example you can use the OSRAM Biolux 965 with a Philips Actinic BLTL-K , or Actinic BL or a 4500K to 5000K Full spectrum Lamp with a UVB Lamp (Ref Full Spectrum Reptile Lamps), this way you will have both of UV Light and enough of Red and Blue Light for the other green plants..
In Metal Hallide one can use the Double Ended Ceramic technology Lamps at 4200K (942) mix it with a Lamp like that of Giesmann 150W DE Marine or use a Giesemann MEGACHROME marine with a Giesemann MEGACHROME tropic.
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