Dick Debartolo has an update of a gadget done a few years back ... it's called the SmartCharge LED Bulb and will not only charge up a supply of power when the electricity is out, but you can then run on that battery power for around 4 hours should the power stay out. 650 Lumens. Preorder the SmartCharge LED Bulb 2.0 via Indiegogo 4 bulbs for $75. They'll ship in May. Retail is expected to be $25 a bulb, so you actually get four bulbs for the price of three during the preorder. (I don't know when that will end.) You'll see a demo in the video below.
Giz Wiz Video: https://youtu.be/e5IaK_DqgzU
Company website: http://www.smartchargelight.com/