An image forming apparatus is disclosed that forms an image based on a control signal from an image processing controlling unit that processes input image information into image data. A seal is provided to sealably bond the elements together in a spaced-apart relationship to define a chamber, and an electrochromic material is disposed in the chamber. In addition, the design of the VCSEL reduces free carrier absorption of 1. This method applies in particular to agricultural sprayers. The data signal terminal is electrically connected to the external equipment at a contact point, for sending and receiving a data signal.