to light /lɑɪt/ /lɑɪt/
to lighten /ˈlaɪtən/ /ˈlaɪtn/
to illuminate /ɪˈlumɪnɪt/ /ɪˈljuːmɪneɪt/
to brighten /ˈbraɪtən/ /ˈbraɪtn/
to turn on /tɜrn ɑn/ /tɜːn ɒn/
to switch on /swɪʧ ɑn/ /swɪʧ ɒn/