How to make the observation useful
Check the exact place where the pot sits in the morning, around midday and later in the afternoon. Record direct rays rather than general sky brightness. Buildings, balcony roofs, trees, screens and seasonal sun angles can change the result, so repeat the check after a major seasonal or layout change.
Light through glass, reflected heat and container temperature can matter even when the duration band sounds similar. Treat the result as one observation alongside the plant’s condition and reviewed species guidance.