"simy1" wrote in message
om...
It may be true but I doubt it. Sodium lamps radiate only at 589 nm.
Many experiments with a variety of plants showed best absorption in
the green and green-blue (350-420nm), which makes a lot of sense since
chlorophyll is, after all, deep green, so you need anything green or
shorter wavelength (higher energy).

I'm sorry to butt in suddenly, but this is totally wrong. The reason why
chlorophyll is green is that it reflects green light and does not absorb it.