That's a question and not a command to 'will this', right?
"The Easter Vigil, during the holy night when Christ rose from the dead, ranks as the ‘mother of all vigils.' (Augustine, Sermon 219: PL 38, 1088). Keeping watch, the Church awaits Christ's resurrection and celebrates it in the sacraments. Accordingly, the entire celebration of this vigil should take place at night, that is, it should either begin after nightfall or end before the dawn of Sunday."
In 1988, the Congregation for Divine Worship and the Discipline of the Sacraments addressed this question with greater specificity in its Circular Letter Concerning the Preparation and Celebration of the Easter Feasts. After repeating the rubric cited above, the Congregation noted that "This rule is to be taken according to its strictest sense. Reprehensible are those abuses and practices which have crept in many places in violation of this ruling, whereby the Easter Vigil is celebrated at the time of day that it is customary to celebrate anticipated Masses (no.78)."
The intention of the Missale Romanum is clear: the Easter Vigil is to take place in darkness. Thus the approved translation of post initium noctis is after nightfall, that is, after the time in the evening when daylight is last visible. This time is roughly equivalent to astronomical twilight, which is defined by the Naval Observatory as the time after which "the Sun does not contribute to sky illumination." Tables of sunset and astronomical twilight for each locality in the United States are available at http://aa.usno.navy.mil/data/docs/RS_OneYear.html.
I teach RCIA, and last year, during the Easter Vigil, we lost power inside the Church for the majority of the Mass. Fortunately, we processed in with candles (and there were a few backup lights on the walls, but not many). I must say, this was a moving experience, as it turned out. Kind of like the old days, I'd imagine! Perhaps we will plan to keep the lights dim more often! But you are right, the ritual should give the indication of going from darkness into the light.
Regards