&gt;It&#x27;s not as if sunlight is a sparse resource (on a global scale).<p>Water is though, especially water that is fit for food production. This process (and others like it) makes a huge improvement on the amount of water required in comparison to traditional outdoor farming.<p>&gt;The lights give them the ability to control temperature, humidity and irrigation, allowing it to cut its water usage to 1 per cent of that needed by outdoor fields, while also growing lettuces two-and-a-half times faster, the experts claim.