When I germinate seeds

[Deruki]

When I germinate seeds, is the sprout that comes from the seed the root, or the vegetation of the plant.
I need to know so that when I plant the seed in the medium I will not do it incorrectly.
the root
Also, does a conversion bulb require a special type of ballast, or will the bulb work on a standard metal halide or hps fixture?

[Ron]

There are two kinds of conversion bulbs. HPS conversion bulbs that work in Metal Halide ballast and MH conversion bulbs that are for HPS ballast.