If you’re going camping this summer, or just want a cheap emergency lantern powered by a pair of AA batteries, you probably can’t do much better than [rimstar]’s Joule thief compact florescent lantern ...

Never worry when the power goes out with battery light bulbs: these self-charging emergency light bulbs allow you to keep a light on even when the power is off and can function similarly to a ...

Since the earliest versions of indoor LED light bulbs were developed, their designers have faced a variety of technical challenges. These include AC-to-DC power conversion, thermal design/heat-sinking ...