"Mr Blue Skye" wrote in message ...
"Rusty Hinge" wrote in message
...
The message
from "Janet & Tim Costidell"
contains these words:

Has anyone done this? My boss wants us (myself and colleague) to grow
tomatoes in the greenhouse for him over the winter. We have good
heating in there, and sodium lighting. [...]

To get good results you have to fool the plants into a belief that it is
summer. The lighting should be daylight bulbs, I don't think sodium
light would be suitable.

[...]

Sodium lighting works just fine (high pressure sodium)

That's fascinating. My immediate reaction was the same as Rusty's:
without knowledge of the subject, the sodium spectrum didn't sound
plant-friendly at all (it's certainly not map-reader friendly!). Does
this mean that *all* plants, *all* the time, don't need the full
Richard Of York deal? I wonder what the implications would be for
insect-pollination. Information, please.

I'm also interested to know, Blue Skye, why you have that kind of
lighting in the greenhouse. What are the advantages?

Mike.