First and second well layers of a light emitting device emit light of different peak wavelengths so as to produce a mixed light, such as white light having high luminous intensity and high luminous efficiency. The beverage contains at least one nutritive sweetener and at least one non-nutritive sweetener. An RFID interrogator on the robot learns from each tag its nature, and based thereon instructs the device to change the dwell time over specified areas. The product material droplets or particles are substantially more uniform in size, velocity, temperature, and melt state than are droplets or particles produced by prior devices. The contacting is conducted under conditions effective to convert at least a portion of the at least one non-aromatic six-membered ring compound in the hydrocarbon stream to benzene and to convert at least a portion of the at least one five-membered ring compound in the hydrocarbon stream to paraffins.