Power Failure Light

Good idea.

From the website:

Power Failure Light

This device attaches between the socket and bulb of a standard table or floor lamp and automatically provides up to 8 hours of uninterrupted light from 6 bright LEDs as soon as power is lost, eliminating the need to search for flashlights during a blackout.

Powered by built-in rechargeable batteries that automatically recharge via the lamp socket once power is restored and never require replacement, the device has an integrated photocell that detects ambient light and prevents the LEDs from turning on during the daytime or when power is restored.

Compatible with incandescent and compact fluorescent bulbs.

5"H x 5"W x 3"D.

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Nice to have on all your lamps, but pricey.

$39.95.