Crazy4fish, Angel in her response suggested you look at the end of the fluorescent tube; at one end it has the name, probably wattage, and maybe Kelvin rating. If you just post all that's printed on the end of the tube, we'll know and advise.
On the gravel, yes, plants will grow fine in regular small-grain aquarium gravel. Large-grain gravel (like pebbles and such) is not so good biologically.
I explain lighting in more detail in part 4 of the stickies at the head of this section, here's a direct link: