Lamp glass

Upon irradiation of solutions of 21a and 22a with the light in their Amax (high-pressure Hg lamp, glass filters), reversible isomerizations occur to form the photoisomers 21b and 22b. The back reactions cannot be thermally driven and proceed only on irradiation of the solutions of photogenerated colored isomers with the light corresponding to their absorption maxima. Spectral characteristics of the isomers of compounds 21 and 22 are given in Table 8.7. 

Fig. 6.1. Cross section of a low-pressure luminescent lamp. / glass tube 2 luminescent powder 3 cathode 4 lamp cap...

Most of the commercial glass by weight is based on the soda-lime-silica ternary system, with minor additions of other oxides to adjust the properties for specific applications. While vitreous silica has many properties which make it desirable for application as a flat, container, or lamp glass, the high melting temperature required to produce vitreous silica (> 2000 °C) precludes its application for the more common consumer products, where cost is a driving force behind the choice of glass composition. 

ZB LAMP glass 1 wt% 8 1850 Internal reflections (monolithic optical maze) Sheik-Bahae et al. (2001)... 

---