A 33 Watt energy-efficient lamp is designed to produce the same illumination as a conventional 30 Watt lamp.?

How much energy does this lamp save during 540 hours of use? Answer in units of Joules.
If electrical energy costs $0.080/kW*h, how much money is saved in 540 hours? Answer in units of dollars.
—I tried doing this problem, but the energy used by the conventional lamp is LESS than the energy used [...] http://bit.ly/8YNN1f