SACRAMENTO, Calif., Sept 30 (Reuters) - Lobbyists in California will be banned from throwing lavish fundraising parties at their homes and offices for state candidates under a bill signed Tuesday by Democratic Governor Jerry Brown, who vetoed other proposals introduced in the wake of a series of ethics scandals. The law prohibiting residence or office-based fundraisers was introduced after a prominent lobbyist was fined $133,500 for throwing lavish parties for candidates, despite a law limiting such events to "meetings" that cost less than $500.