The Philips Hue is one of a new breed of light globes. It's built around a high-efficiency LED light, with a cluster used to equal the output of a traditional 50-Watt incandescent light globe. It's also got built-in Wi-Fi, which you can use to turn the lights on and off remotely, and change the colour of the Hue's light output.
This is the Philips Hue introduction pack, which has three globes and the ZigBee Wi-Fi switch that lets you control the globes with your smartphone or tablet on a Wi-Fi network.
You can read more about the Hue here.