Supplemental lighting has been around for years. What has changed is the type of supplemental lighting.
Historically, in greenhouse vegetables—floriculture is a bit different—it's been high pressure sodium, HPS, that has been used for years. Now there is more movement to LED lights. There's even movement to things such as plasma lights.
The technology itself has changed. The efficiencies of them have changed. We've done a lot of research on lighting to see which lighting is the best and which can use less energy. LEDs can use a lot less electricity than HPS. It's moving towards that technology that will provide more for the crop, more targeted spectrum of light, and other advantages with different lighting systems.