Extending Outdoor Light - ? For Experts

I have a bunch of healthy clones growing on a two week production cycle indoors. These get taken up to a farm for flowering. The deal is that I have limited space indoors, but practically unlimited outdoors. So I want to veg as many as possible indoors, and take them up to the farm as young as possible. In other words I'm not so concerned about big yields per plant as I am about decent yield on more of them. What I'd like to try is putting some lights outdoors at the farm in order to extend the daylight hours. We get 12 hrs of daylight 365 days a year. So I want to get the plants out early, but would like to prolong their veg time outdoors.

My question is: How much light is needed to keep a plant vegging? I'm thinking that I could put them on the farm to give them the 12 hours of full sun and then just putting some flourescents on them to extend the light another 6 hrs to keep them vegging at the farm for a couple more weeks.

¿Loco? Anyone tried this?

Many thanks for any advice...

I'm sure you can do that but if there's not something reflecting the light like an inclosure with that special reflective wall paper (the technical term escapes me at the moment) you might need quite a few bulbs and that might draw alot of attention

Just keep pumping them outside ...and let them flower

Thanks for the replies - GLH: yeah, I guess I'm always looking for a better way, when nature's way is probably best. I guess I'm concerned that I'm losing a lot of yield by having the 12 hr sun trigger them to flower so young rather than letting them veg out more outside for awhile...

grow them behind the barn and put an HPS or MH light mounted right on the barn. put it on a timer to come on for a few hours before sun-up.
having a light on outside the barn at a farm at 3 am. should not be noticed that much.