The light-bulb above is, of course, not plugged in. Iridescence is supplied by the refraction of a laser light within the glass and internal air. A blue laser would have even more refraction, however these are usually not available commercially. Below is a light projection of D.C. using laser carved glass. The light is aimed through this glass(the center) and refraction along the internal cuts and fractures causes higher dispersion which creates the dark projections.
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