bulb to cool only one part application_number US 77899101 A description a bulb of the preferred type is shown in fig1 this bulb has a central portion 100 which emits light and edge portions 102 104 at least one of which need to be cooled the central portion 100 which emits the light is preferably not cooled the bulb used herein is called an msr sa or short arc discharge bulb other bulbs have similar cooling requirements the edge portions 102 104 should preferably be kept between 400 and 450 u00b0 c the bulb is mounted as shown in fig2 when mounted in this way the far edge portion 104 is often sufficiently cooled by ambient to be kept within the desired range however the near edge portion 102 gets very hot due to the proximity to the ceramic base 110 and also because of its electrical connection also as described above cooling should not or should only minimally touch the center portion 100 fig2 shows the bulb 99 placed relative to a portion of the reflector 200 the base portion 110 of the bulb is shown connected the reflector 200 includes an outer edge 210 and an inner edge 220 a metal air deflecting portion 230 fits within the inner edge 220 and directs air from a fan to the close pinch portion 102 of the bulb which is close to the reflector fig3 shows the rear view of the system an air chamber 300 is attached.