greenhouse that is in the shade
 

Hello Ron,
Your site is great, and already a 'mini-history' of hydroponics (going back nearly 3 1/2 years)
I couldn't find much on using anything but 2L or 1 gal containers--but it seems that a 'hybrid' system using 3L+ and 1.5L bottles would be ideal for say letuce and tomatoes, etc. Any ideas about a design and pump, etc?

Also, re: lighting. What do you suggest for a greenhouse that is in the shade (east side of house) for at least half of the day: sodium or MH, or one of the newer 'warm MH' Phoenix Gary

Because your greenhouse is sunny for the first half of the day with mostly white sunlight then I would use HP sodium because that's the kind of light you would be lacking the last half of the evening. Ron