You Can't Beet This. It's 24-Carrot Gold.

Lettuce See the Future: Japanese Farmer Builds High-Tech Indoor Veggie Factory

Shimamura turned a former Sony Corporation semiconductor factory into the world’s largest indoor farm illuminated by LEDs. The special LED fixtures were developed by GE and emit light at wavelengths optimal for plant growth.

By controlling temperature, humidity and irrigation, the farm can also cut its water usage to just 1 percent of the amount needed by outdoor fields.