@houseplantjournal: Here’s a slower cut of an oxalis time lapse I did that included a light meter. O…

Here’s a slower cut of an oxalis time lapse I did that included a light meter. On its current setting, it maxed out once the light surpassed 500 foot-candles.
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Watch how the oxalis leaves seem to deflect when touched by direct sun, indicating that perhaps the plant is optimizing its leaf angle so as to not take too much direct sun (i.e. maximum radiation absorbed when leaf is perpendicular to the sun beam). I need to repeat this time lapse using my other light meter that can read up to 10,000 foot-candles.
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Another observation (which I’ve mentioned before): watch how the light meter’s needle moves precisely with the light intensity, as it should – it is responding purely in a physical manner with light intensity. But note how the oxalis leaves open just BEFORE the first morning light and stay open until AFTER the evening dimming of sunset – the leaves respond in a biological manner, anticipating the time of sunrise and confirming the fall of night. Plants have a memory of the length of night, which can be disrupted. I’ll show you an experiment I did another day…
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