Trendnet's $100 TWC-L10 Indoor HD Wi-Fi Light Bulb Surveillance Camera sends prompt motion alerts and you can adjust the base of the bulb to suit different sizes and styles of recessed light fixtures.

Currently the two downstairs use BE15R30/SW (15W) CFL light bulbs (looks like your regular recessed flood light), while the one upstairs uses a FLE15HT3XXLL (15W) CFL light bulb (just a normal ...