Mystyraine,
Not sure why you really want to do this as Orchid's only have a short ( maybe 5week flowering cycle .
The only Orchids I have in my systems are Dendrobiums but as soon as you take them out the fizzle out.
I spoke with a commercial grower recently and he has 4,000 plant's which he keep's on a steady drips for 4 month's then sell's as they flower.
Unless you are doing it commercially it's probably not
worth the effort.
Don't get me wrong. !!!!!!!!
I grow them but just 4 myself.
Kind regards.
Rosco.

I'm looking at orchids because they appear to be well suited to hydro and HID lights. The biggest stumbling block seems to be how long it takes to get a crop, be it cut blooms or small plants. I used to be a florist so my inclination has been toward blooms for weddings. But perhaps, since I'm having a hard time choosing which plants I want most, I should concentrate on plants for propagation.

Mystyraine,

You might find what you are looking for at Geoff Hands website at http://www.users.waitrose.com/~orchids/ He grows many of his Orchids in Hydro and Semi-hydro. In any case it's well worth a look.
Good Luck,
IanS