Gene -

not exactly understood your question - you want to reduce the light from 2000 footcandles down?

I raised my own tomato plants from seed for years - and they are survivors. Even if they are full light plants (5000 fc) they will survive on much less - they will be spindly and pale but you will not kill them.

Since I am planting them in a soil in the end of May - I can just plant them horizontally, they will send roots all along from buried stems and they will catch up in a couple of weeks.

But since you are putting them in a greenhouse - too long of a stem can be a problem. I was advised to brush them with a hand from time to time - to slow them down from growing up too much.

Good Luck and Tasty Tomatoes to you

Irina