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Siemens Sieray 30mA HFAC
Spectrum of Siemens Sieray high-pressure Hg lamp operated from a 30mA high-frequency signage ("neon tube") inverter. 




Hg Hanovia Home Sin 30mA boro
Hanovia HomeSun "Sun Ray" lamp of late 1930s vintage. This has a fused silica-glass envelope, and was used without filtration on the basis that it could produce a sun tan. Users had to wear green goggles in order to avoid developing cataracts. Here the tube is operated from a 30mA high-frequency signage inverter and placed inside a borosilicate tube to prevent the UV emission at 254nm from causing harm.









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