About 200 sodium lights help create the effect of a sunset

The work, by Danish-born artist Olafur Eliasson, uses mirrors, light and mist to create the illusion of an amber sun glowing through clouds.

Called The Weather Project, it fills the vast turbine hall of the former central London power station.

But it had led to complaints from staff who said it was making them feel ill.

Cubist buy

Some attendants complained that the concoction - made from sugar and water - left them unwell, although an investigation found that the mixture was harmless.

Eliasson's work, based on the British obsession with the weather, involves 300 mirrors on the ceiling and more than 200 lamps behind a semi-circular screen.

Meanwhile, the Tate said it had acquired an important painting by cubist painter Georges Braque.