I used my CyberPower 1500AVR to power my Cable Box and 16" TV for about 90 minutes after one of those little hurricanes in Florida in 2006. Probably more wattage than a couple of compact florescent or incandescent bulbs.

Note 1: The CyberPower 1500AVR is a switching UPS, and is not a "cold start" UPS.

Note 2: Microwaves CANNOT be powered by a UPS.

Edited to Add:
Note 3: You have to be able to put up with the "BEEEEEEPPPP" every 3 seconds, or find the speaker and disable it.