From the RFID in Japan blog:
Light Bulb Says “I died”
Another application of the Fujitsu’s technology (the one used for notifying about lost children) is smart light bulbs.
It doesn’t even need a QR code. Some signal is engraved in a contact part of a light bulb. When a light bulb dies, it can then send out the signal via a power line and then to the Internet so one can get a SMS message saying “Buy a new light bulb.”
this technology is expected to reduce the cost for realizing a kind of “internet of things” environments
Is it just me, or wouldn’t it be more useful to send an alert before the bulb blows? 
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