There are 3 main types of lights that growers use: Fluorescent, Metal Halide, and Sodium Vapour.
Fluorescent lighting is only good for rooting cutting, and growing small plants during the veg cycle. If you use fluorescent lights during budding you will end up with tiny, airy buds.
Serious growers require serious lighting, namely metal halides and sodiums.
Vegitative Growth
Metal halides are a relativly inexpensive high intensity light. The are recommended for the veg cycle but can also be used for the flowering cycle with excellent results.
Flowering
Sodium vapor lights are more expensive that halides and are the light of choice for the flowering cycle. By switching to a sodium when you bud your plants you will end up with tighter, denser nuggets.
