Let there be light: German scientists test 'artificial sun'

Scientists in Germany flipped the switch on Thursday on what's being described as "the world's largest artificial sun" and which they hope will help shed light on new ways of making climate-friendly fuel.

The giant honeycomb-like setup of 149 spotlights officially known as "Synlight" in Juelich, about 30 kilometres west of Cologne, uses xenon short-arc lamps normally found in cinemas to simulate natural sunlight that's often in short supply in Germany at this time of year.

By focusing the entire array on a single 20-by-20 centimetre (8x8 inch) spot, scientists from the German Aerospace Center, or DLR, will be able to produce the equivalent of 10,000 times the amount of solar radiation that would normally shine on the same surface.

Creating such furnace-like conditions with temperatures of up to 3,000 degrees Celsius is key to testing novel ways of making hydrogen, according to Bernhard Hoffschmidt, the director of DLR's Institute for Solar Research.

Many consider hydrogen to be the fuel of the future because it produces no carbon emissions when burned, meaning it doesn't add to global warming. But since hydrogen doesn't occur naturally, it first has to be made by splitting water into its two components the other being oxygen in a process that currently requires large amounts of electricity.

Researchers hope to bypass the electricity stage by tapping into the enormous amount of energy that reaches Earth in the form of light from the sun.

Hoffschmidt said the dazzling display is designed to take experiments done in smaller labs to the next level, adding that once researchers have mastered hydrogen-making techniques with Synlight's 350-kilowatt array, the process can be scaled up ten-fold on the way to reaching a level fit for industry.

The goal is to eventually use actual sunlight rather than the artificial light produced at the Juelich experiment, which requires as much electricity in four hours as a four-person household would use in a year.

Hoffschmidt conceded that hydrogen isn't without its problems for one thing it's incredibly volatile but by combining it with carbon monoxide produced from renewable sources, scientists would, for example, be able to make eco- friendly kerosene for the aviation industry.