On: Vertical farming does not save space

[kibwen]

Grow lights are quite good at only emitting light in certain parts of the spectrum, and have been for some time now.

[falcolas → kibwen]

Just looking at some spectrum charts for grow lights... They certainly vary, but not in any uniform fashion.

There is an exception to this: there is a standard LED graph which shows up quite frequently, identified by it's peeks in the deep reds, yellow, and dark blue, with a marked trough at cyan.