YardG
Well-Known Member
Not my idea, but it's been discussed in outdoor threads that human's perception of light and what plants respond to is different, i.e. we think it's fairly light out, they still act like it's dark. That's why people generally use official sunrise and sunset as a measure of the length of the day from the plant's perspective, rather than the longer twilight measurement.
A bright artificial light is different (hence the gas lamp method), essentially like the sun suddenly coming up in the middle of the night.
A bright artificial light is different (hence the gas lamp method), essentially like the sun suddenly coming up in the middle of the night.