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Rising and falling footcandles

This is a discussion on Rising and falling footcandles within the General Orchid Culture forums, part of the Orchid Culture category; Lijun - don't forget that light intensity falls off with the inverse square of the ...

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  1. #11
    raybark's Avatar
    raybark is online now Senior Member
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    Ray Barkalow
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    Oct 2012
    Oak Island NC


    Lijun - don't forget that light intensity falls off with the inverse square of the distance, so that as bright as your streetlights are, by the time the light reaches the plants, it's a tiny fraction of that intensity. Another part of the problem is that the human eye adjusts very well, so light that is in all probability not detected by a plant is still quite visible to us.

  2. #12
    lijun's Avatar
    lijun is offline curious
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    exploring and getting greedy
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    May 2014
    north sumatra, indonesia
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    ow,.. i c,.. so there is nothing to worry,... thank you ray for explaining,...

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