East Window versus West Window
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East Window versus West Window
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Old 02-27-2018, 11:21 AM
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East Window versus West Window Male

Originally Posted by Orchid Whisperer View Post
In the morning, the east/morning sun is more likely to be cutting through more haze/fog/humidity than in the west/evening. Hence dew in the morning. That cuts down light intensity.

That lower morning temperature may be a factor too. Though I think it is more important for plants grown outdoors.
Originally Posted by Ray View Post
The hydroxyl radicals within water (the O-H bonds) have a resonant frequency that is a close match to part of the infrared spectrum, which might attenuate some of the morning heat.
I do not have any data to support this following premise, but follow my logic if you will ...

The diffusion of light factor through fog/moisture in the air as OW mentioned could very well play a role in lower morning light intensity. However, a possibly equally or more significant factor would be what Ray alluded to in combination with another idea put forth by OW. First some ground work:

1) Water is a "heat sink" ... that is a basic fact. Compared to many substances, water requires a surprising amount of energy to raise its temperature, and loses that energy quite slowly. (Note: It is not an uncommon practice in some northern areas for gardeners to protect early spring plantings from unexpected frosts by placing a "water wall" around plants. Theoretically, during the day, the water is heated by sunlight and over the course of the night releases enough heat to prevent frost damage. Never having put this to the test myself, I am forced to rely on some hearsay as to the efficacy of this use.) In addition to energy absorption to raise temperature, even more energy (a surprisingly high amount, in fact) is required for water to undergo a phase change or "change of state" (solid --> liquid, liquid -->gas).

2) The infrared part of the light spectrum is the heat portion of the spectrum. (Interesting science tidbit -- at least to me -- there are animals like some snakes which are capable of "seeing" in the IR spectrum.)

3) Fog is a colloid -- a suspension of water droplets in air.

So over the course of the night, water vapor (a gas) in the air often loses enough energy (cools) to condense into water droplets which, if small enough, remain suspended in the air. Some of the IR (heat) energy of morning sunlight is absorbed by the suspended droplets -- warming them and giving them the energy needed to undergo the phase change to vapor. Over the course of the day, ambient temperatures continue to rise as the airborne water reaches its absorption capacity of heat energy at that intensity. Thus the commonly observed phenomenon of it being cooler in the morning than afternoon.

Now having said all that, while AC obviously offsets the impact of outdoor temps, it is also commonly observed that temps will be higher during the summer months right by the window than deeper within the AC cooled room. By extension, it would be very plausible for south or west facing window areas in the northern hemisphere to be warmer, as a result, than the east or north facing ones.

Another point of note, such differences between east vs west are themselves can be significantly impacted by many factors such as: season; climate (arid areas such as Arizona will have far lower outdoor RH than places like Hawaii or Louisiana, for example); and presence or absence of trees, awnings, or other obstacles to the sunlight shining on/in/through said windows.

“Wisdom is not a product of schooling but of the lifelong attempt to acquire it”
-- Albert Einstein
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Old 02-27-2018, 02:03 PM
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East Window versus West Window

I grow some higher light orchids in a West window. My Cattleya aclandiae is very happy as are all my walkeriana hybrids and the Angraecum magdalenae. Basically, what grows well in a South window without any curtains will usually grow well in a West window, too.

The problem with any plant is heat + light - breeze. If you open your windows in the summer, the plants should be fine. That is what I do.
I decorate in green!
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