light fixture is shown in fig6 a and 6 b a light source 6 in each figure emits broad spectrum radiation including at least some ultraviolet and or blue wavelength light radiation this light is passed through a clear glass or other transparent translucent material substrate 7 to which is applied by like methods as for application to lamps a covering of polyimide 8 in particular the polyimide covering 8 can be applied as self adhesive polyimide sheet or as polyimide sheet held with polyimide tape the polyimide covering 8 may alternatively be applied by any of painting spray painting spin coating dip coating or other methods as are known in the art for the application of liquids to surfaces equivalent views of a same step in the application of polyimide to respectively a fluorescent and an incandescent lamp by process of dip coating are respectively shown in fig7 a and 7 b each process uses a bath 9 containing liquid polyimide resin and of suitable size and shape to dip an electric lamp the extraction of the tube of a fluorescent lamp is illustrated in fig7 a the extraction of an incandescent lamp in fig7 b extraction should be smooth at a slow and uniform rate of approximately 1 inch per minute the exact extraction i e dipping rate is empirically determined by the resin used and the desired thickness of the coating a view of a step in the application of polyimide to a fluorescent lamp 2 by process of ring coating is shown in fig8 a cross sectional view taken along aspect line 9 9 within fig8 of this ring coating process is shown in fig9 the ring coating is realized by pulling the tube of the fluorescent lamp 2 through.