Earthlight is a company the makes biodiesel from non-food plant sources. By utilizing the combined power of the earth and sun, Earthlight is able to create fuels that are more sustainable than petroleum based fuels. To reinforce the relationship between the earth and sun the logo was created by merging these two primary elements. The Earthlight brand identity borrows heavily from the automotive world, photography, illustration and typeface use or is inspired by moving vehicles. Light is also incorporated into the Earthlight designs in the form of imagery, transparency and cutouts.
You can see the finished designs here.