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Relative Light Requirements of Paphs

This is a discussion on Relative Light Requirements of Paphs within the General Orchid Culture forums, part of the Orchid Culture category; Yeah! Speaking of east exposures, I took a light meter reading on the morning of ...

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  1. #11
    Aerides is offline Senior Member
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    Yeah! Speaking of east exposures, I took a light meter reading on the morning of a cloudy day and it was ALOT brighter than I thought (it's actually an east-southeast window) - it registered around 4,000 fc! I guess the problem with growing standard cattleyas in such a window is that they're too big for the light to reach all parts of the plant (?) And if the day is cloudy or its wintertime or something, the four or so hours of brighter light in the morning isn't enough. I did try to bloom catts in that window before I got my light setup. Not much luck.

    OTOH, I have a geranium happily growing and blooming in the window now. Don't people grow these in full sun outdoors? This is confusing, but I think the geranium's days may be numbered.....

  2. #12
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    Jmoney is offline Senior Member
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    Not sure what light meter you're using, but I've been told that they are notoriously inaccurate and variable in general. Not saying that yours is per se, but just that on a personal note, I'm not a big fan of "fc" measurements. I can't imagine that a cloudy E or SE window can be 4000 true fc. That's macrocatt & big vanda range...which won't be happy with cloudy days!

  3. #13
    Aerides is offline Senior Member
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    You may be right, Jason. I have wondered myself if it is overcalibrated.

    I think I'll take readings every day for a week and record weather conditions. Just to see what I come up with.

  4. #14
    Heather is offline Banned
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    Hm, I'd love to hear the results of that!

  5. #15
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    OrchidTraci is offline Senior Member
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    Quote Originally Posted by Heather
    Curious also since you always hear the "mottled leaf=lower light" vs. "strap leaf=higher light" rule of thumb. The parvis I am not really sure of, but so far keeping mine in lower light than the multiflorals and most of the phrags. I would think maybe your roth hybrid might like brighter light, but not sure about the other parent.

    Maybe I am nuts, but I am growing both of my paphs about a foot behind my high light orchids. They are growing like weeds and have no sunburn. Of course, I slowly conditioned them to take more sun.

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