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As most plastics used in specimen tubes will melt if sterilized with heat the plastic tubes are normally single use
the first electronic computers were built before the invention of the transistor or integrated circuit chip. They used vacuum tubes for the processing and temporary memory. In Britain those tubes were called valves.
Some early flat screen TVs used cathode ray tubes, but the flat faced tubes were harder to make and heaver than the older curved faced tubes. When newer designs (e.g. plasma, LCD, LED) came out that naturally produced flat screens and were lighter weight than cathode ray tubes, they rapidly made flat screen cathode ray tube TVs obsolete.
I think that you may be confusing fluorescent tubes with neon tubes. Fluorescent tubes use a phosphor coating on the inside of the lamp which is in a limited spectrum. Some tubes are cool white, warm white, and daylight. There is also a gro lux which is on the warm end of the spectrum used for growing indoor plants.
You can use a wire instead of the starter to test the tubes .. I did it, it works !