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houseplantjournal: #tbt when I visited @jamesipy in Singapore. – Lesson on light: the human percept…

#tbt when I visited @jamesipy in Singapore.

Lesson on light: the human perceptual system (eyes and brain) is a terrible judge of absolute brightness because it is great at normalizing the brightness over a wide range.

If you were standing where James was in person, you would perceive the details both inside (furniture, plants) and out (balcony plants, other buildings).

But in this photo, the outside details are lost (overexposed) while the inside seems quite dark.

Many would think “well maybe the camera isn’t good enough” but, in fact, the camera is being a very consistent detector of light – as in, every pixel is capturing at the same sensitivity but the light that’s coming from the sky is just that much more intense than the light coming from the indoors.

Your eyes and brain are working together to normalize these differences so that you can better *IDENTIFY* the objects in your surroundings despite drastic differences absolute brightness.

This means trying to judge brightness by “estimating brightness” will be prone to error and vague descriptions that mean different things to different people.

Fortunately, plants that need “full sun” and “part sun” can be easily interpreted as “the sun needs to shine directly on the plant for x hours”

But what about “bright indirect light” – what environmental indicators should you use to ensure a plant is getting this type of light?

I’ll write more tomorrow but if you’ve followed me for any length of time, you’ve probably already heard my guideline surrounding how to achieve “bright indirect light”
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