circular fluorescent tube burned out and blackened at the cathodes

alternative arm blackening bottle brand brown cathodes circle circular coating contact conversion cost costly current dark drink electric electrodes electron emission energy energysaving expectancy finger fluorescence fluorescent food footwear furniture gadget gasdischarge glass glasses glow guitar hand inside jewellery lamp leg life light lighting limb lowpressure mechanism mercury mercuryvapor mix obsolete orange organ oxidized pad phosphor photon pin prongs round running skin source sticking technology thermionic tube tubelight undefined visible white wood yellow