i have a grow-light for starting plants... but just recently learned that it has to be within a couple inches of the plants to prevent them from being stringy. it also helps to have an oscillating fan near-by to simulate wind and make the plants stronger.
as a reminder, the best seeds -in our opinion- are open-pollinated, non-hybrid seeds. reason: they can be harvested and re-planted. (something about retaining the integrity of the original seed and not cross-pollinating to make cantaloupe looking zucchini).