Another FYI on magnetic transformers: If a magnetic transformer is used to supply a one-lamp fixture and that lamp burns out, you do not want to keep turning that fixture on before the lamp is replaced. Operating a magnetic transformer with no load on it will burn out the transformer.

Another caution regarding track lighting installs: Fixtures are available for line-voltage (120 V) track that can utilize incandescent, fluorescent (compact or T5), magnetic low-voltage, and electronic low-voltage. Be careful about mix & match of these fixtures when connecting to dimmers both at the time of installation and as a warning to the client for future adds and changes.