There is a wide range of grow lights available. Pays your money, take your choice. Halogen bulbs on the whole are a bad idea as they tend to have a narrow spectrum and get too hot. Generally speaking the best kinds are specialsed fluorescent or gas discharge (eg high pressure sodium), although you can also make an effective LED light. A lot of people just use ordinary fluorescents because they are cheap, though you can get specialised fluorescents with a better matched spectrum.