... Exhaust Tube, Lamp Tube FeatureAlso called Black Blue Glass or Ultraviolet Glass Tubing. Its a kind of very deep violet-blue ... visible red wavelengths. ApplicationUsed to make "Black light" or Ultraviolet lamp ("UV" lights) which is widely used in inspection of industrial ... of check, currency, ID & passport; criminal investigation. Also the UV lights are applied as decoration lights for DISCO, pub and ...