{When I am in the world} (hotan en t(9369) kosm(9369) (935c)).
Indefinite relative clause with hotan and present active
subjunctive (935c), "whenever I am in the world." The Latin Vulgate
renders here hotan by _quamdiu_ so long as or while as if it
were he(9373). But clearly Jesus here refers to the historic
Incarnation ( 17:11 ) and to any previous visitations in the time
of the patriarchs, prophets, etc. Jesus as God's Son is always
the Light of the World ( 1:4,10  8:12 ), but here the reference
is limited to his manifestation "in the world." {I am the light
of the world} (ph(9373) eimi tou kosmou). The absence of the
definite article (	o ph(9373) in  8:12 ) is to be noted (Westcott).
Literally, "I am light to the world, whenever I am in the world."
"The display of the character varies with the occasion"
(Westcott).