From the results and discussions in the previous chapters we are now familiar with the idea that to produce high-quality illumination, lamp and luminaire designs must be suited to the intended applications. Incandescent and fluorescent lamps that we see today are optimized not only based on their sizes and shapes required to address broad applicability, but also based on manufacturing constraints. Many technologies often face limitations that primarily result from inherent phenomena, which affect manufacturing feasibility and in turn compromise product performance. For traditional lighting, it has been practical for manufacturers to produce a small variety of general category lamps and have lighting professionals primarily construct luminaire designs to suit many different applications. The lighting industry thus far has been largely addressing the different illumination requirements of specific applications by designing suitable luminaires around these general category lamps; understandably, then, the field as a whole became divided into two distinct groups: lamps and luminaires.