intensiivse ultraviolettkiirguse (lainepikkusega 185 ja 253,7 nm) allikas, mille sisepind on kaetud mõne metalli (nt indiumi või galliumi) amalgaamiga, kontrollimaks elavhõbeda aururõhku lambis, intense source of (ultraviolet) (185 and 253.7 nm) radiation produced by an electrical discharge in a lamps with the inner side covered by an amalgam of mercury with another element such as indium or gallium to control the vapour pressure of the mercury