In tube light,marcury(Hg) gas is used. When,using choke coil, sufficient voltage is generated across tube light,this gas will be ionized, & emit ultra violate ray. This ultra violate ray struck the flourescence coating(f.c.). Now,f.c. will emit visible light (nature of emitted light depends on their bandgap).
*so,without f.c. ultra violet ray will emitted from light.
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