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Epilogue
One can acknowledge the attractive features of incandescent lamps, such as the
high color rendering index of the white light they emit and therefore the near
perfect color reproduction of the illuminated objects or the robustness and long
life of the light-emitting diodes or the efcacy of the electrical discharges. All
technologies have attractive characteristics and can still play a role in different
areas. If that was not the case and a light source product or technology could not
offer unique or competitive features, then it probably would have been obsolete,
retired, and most likely mentioned only as a historical footnote next to gas and oil
lamps. When one selects a light source to be used in a specic area, many param-
eters ...