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Thread: Still having Lighting Problems.

  1. #1
    Nepenthes Specialist nepenthes gracilis's Avatar
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    Hey guys I am still having problems with my S.Leuco and Flava var. Flava. I bought a 2 foot (60CM) shop light fixture with 2 2 foot (60cm) Gro Lux (reccomended by D'Amato in his book) to fit into the fixture. My VFT's are OK but not great and my Sarracenia anr not good. Flava leans over and leucophylla doesn;t but no pitchers. Any ideas? should I mix the lights with 1 cool white and leave the other the Gro Lux as it is a Gro light. Thanks all!

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    I have never had success using flourescents on mature Sarracenia. The problem is that the light falls off quickly the greater the distance from the bulbs. Light follows the law of inverse square, light twice the distance from the bulbs is four times less bright. This means that the light reaching the growing point on the surface simply is not enough to promote healthy compact growth, and the plants etiolate to try to reach the source which is why you have floppy plants. With Droserae, the growing points can be positioned close to the bulbs, and this results in good growth. Sarracenia are too tall to allow for this close placement, and are really best grown outside in full sun. If this is not possible, you will need (4) 40 watt bulbs minimum, and 6 are better, and even then the results are not optimal. Even with my 1000 watt system both Sarracenia and Dionaea are less than happy.

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    Nepenthes Specialist nepenthes gracilis's Avatar
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    Ahh, I see now. Well I WOULD put them out in the sun except it's a bit to cold here now. You know how cold it is in Osewego! Think of it up here near Watertown!

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    Tony Paroubek's Avatar
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    Try and get them into a southern or western window for some natural sun. Another thing you could try if you have more than one light fixture you could try putting one vertical so that it is parrallel with the tall Sarracenia leaves. This would allow much more light to hit the leaves since the bulk of the plants photosynthetic material is in a vertical position. This may also cause them to lean.. requiring alot of pot turning!
    T

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    Quote
    Quote: from Tamlin Dawnstar on 11:54 pm on April 24, 2002
    The problem is that the light falls off quickly the greater the distance from the bulbs. Light follows the law of inverse square, light twice the distance from the bulbs is four times less bright.[/QUOTE]

    This is true for a point source of light. The flourescents being used are considered extended sources and the relationship is a little more complex I think. The bottom line though is the plants are not getting sufficient light.

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    Hi Nep G,
    Last time we chatted, you were talking to your dad about getting a greenhouse, now that would solve everything....!

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    Nepenthes Specialist nepenthes gracilis's Avatar
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    Yes Mike but you mistunderstood me I said my dad was goign to help me GET a greenhouse for ME on his dad's property across the road. Get it now? [img]http://www.**********.com/iBhtml/non-cgi/emoticons/smile.gif[/img] I know it is a little confusing. Tony, what about "E"-glass that is what my mother had installed a few years ago it just simply keep your inner home form tthe fading caused by sunlight. Will that affect the spectrum? Thanks.

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    Tony Paroubek's Avatar
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    I don't think E glass is too much of a concern. Fading from sunlight is caused by the uv rays which are much shorter than the 420 nm wavelength that chlorophyll absorbs.
    Tony

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