An optical unit includes a light source that emits light to be projected onto a screen, one or a plurality of optical elements that controls a spread of a beam of light from the light source to the screen, a combining element that combines the light emitted from the light source, and a scanning element. In a nonvolatile memory such as a flash memory, data is determined at the time of writing operation. A controller is operatively connected to the source to control emission of the UVC light and establish at least one of a suitable duration of a decontamination process and a suitable intensity of UVC light to render the target object pathogen reduced. The undersurface of the base is formed with a groove to improve the strength and durability of the weld. In arrays consisting of more than a single PE, the software controllable context switch mechanism is used to reconfigure the array to take advantage of the multiple context support the merged SPPE provides. The antenna can be made to simultaneously cover both 850 & 900 bands with the ground plane small enough to be implemented in a mobile phone or the like.