LEDs flash on and off, so the principle seems to work.

ECONOMIST: Microelectronics

LEDs to flash, Dr Parviz has shown that circuits can be built at room temperature this way.

ECONOMIST: Microelectronics

However, it does come with a proper xenon flash instead of ordinary LEDs like most phones and the pictures are far superior to those of the K750.

ENGADGET: Sony Ericsson K790/K800 reviewed Mobile