Here’s a bright idea for the planet. A Hong Kong-based company has introduced what it bills as the world’s only solar-powered light bulb with the hope of reaching millions of people with little or no access to electricity.

The Nokero N100 solar LED light bulb is meant to replace kerosene lamps as a lighting source in the developing world. The company says 1.6 billion people still lack sufficient access to electricity, and many burn fossil fuels for light, which can be dangerous and expensive.

The N100 solar bulb is about the size of a standard incandescent bulb and has four small solar panels in its rainproof plastic housing. Five LEDs and a replaceable NiMH battery inside provide up to four hours of light when the device is fully charged. People hang it outside during the day and then turn it on at night.

Weather, seasons, and latitude can affect charging times. Nokero asserts that one day of charging in the sun can provide about two hours of light, though charging near the equator can provide more. So on a cloudy winter day in northern latitudes, the bulb would probably not be able to replace a kerosene lamp, but on a clear summer day […]