Blurb from the Zazz site:
Works as a regular bulb by using remote - internal battery charges to provide emergency light in emergencies
Fits into a regular E27 light fixture and operates as a regular light with included remote control
Automatically switches on to provide emergency lighting when your power is down
Battery integrated into unit and 19 LEDs provide a bright, clean light
Remote control gives you control from up to 10 metres away
Long life - around 50 000 hours
To use in regular ceiling outlets switch the mode to AC
4.0 V / 0.6 AH Sealed lead-acid rechargeable battery
AC and DC compliant - Switchable current design allows use in AC and DC fixtures
Infrared remote allows control remotely
220-240V Input Voltage
Plastic construction
50/60 Hz
E27 fixture
19 LEDs
Charging time: approx. 20 - 24 hours
Operating time: Approx. 8 hours
Measures 115 x 120mm
A quick search has these at US$6-15 on alibaba - ebay $8.66 from China. Worth looking at if you're expecting summer blackouts.
Shipping is capped at $10 for multiple items
Hmmm, interesting product. Bit confused about how it works though - after reading the instructions, it sounds like it turns on/off opposite to the light switch it's plugged in to. Eg: if I have this plugged in to my kitchen area and I turn off the lights, this will turn on? If so, I guess you'd need this plugged in to a separate lamp or something?
Instructions for use
Leave the switch on DC at all times
The light switch (on your wall) being in the ON position will cause the bulb to be OFF (and charge)
The light switch being in the OFF position will cause the bulb to be ON
A power cut will be the same as switching the switch off, meaning the bulb will turn ON
The remote will work as designed
If you want to leave the bulb on for an extended period of time (hours), flick the switch on the bulb to AC in which case it will just use the power from the light socket