These are the Lili Lites and they are not a concept. They are available to buy and buy now. They cost 99.00€ each plus postage – ouch – but they are both beautiful and ingenious.
When your half-read book lies open above the light, the LED stays off. When you remove your the novel, the light goes on and you can read/not sleep. Now, if they had somewhere you could rest your glass of water and alarm clock we could do away with those space-thieving bedside tables altogether.
Lili Lite (via Coolest Gadgets)