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Fake TV:

If you are looking effective, affordable way to deter criminals from breaking into your home at night, the FakeTV Burglar Deterrent is the perfect solution. FakeTV is a plug-in unit about the size of a coffee cup that simulates light output equivalent to a typical 27" TV. A built-in light sensor automatically turns the device on at night and/or when lighting in a room turns black (at 0.5 lux). From outside your home, it looks like someone is home watching TV.

I thank Denis Grosz for the pointer.