growing tomatoes/herbs under 400 watt mh/hps

anyone ever tried this? if my hobbies and interests change, i'd like to be able to use my lights for something constructive

maybe there's a guide around here or something?

ive done it using hydro and a 400w mh. they came out good and it seemed like they enjoyed the mh better than the hps. I had tomatoes and peppers.