All Porsche 356's sold in Europe were delivered with headlights featuring an outer lens which focused the lights. The bulb is placed in the back of the reflector which can be either an incandescent bulb or an H-4 quartz bulb -- quartz gives the best light. Bulbs for these Euro Lights - P45T base 6V Tungsten 6V Quartz 12V Tungsten 12V Quartz