Was anyone there who knew if the match stopped before or after half time?
Citing the laws of the game, if the lights failed before half time then the match will be considered a draw but the current scores will still be taken into account for percentage. After that point, though, the team in front will be deemed the winner.
10.6.2 Incomplete match
If a Match is unable to commence or continue within the time
scheduled for the Match for reasons beyond the control of
either Team (including circumstances where it is unsafe for the
Match to proceed) the following shall apply:
(a) Match Not Commenced
The result of a Match which is unable to commence for reasons
beyond the control of the Team shall be determined
by the Controlling Body.
(b) Prior to Half Time
If a Match has commenced but is not able to proceed at any
time within the time scheduled for the Match, the Teams shall
depart from the Arena.
If the Match is unable to recommence within a 30-minute
period, the Match shall be deemed to be drawn and the scores
of the Teams at the time the Match was interrupted shall be
used in calculating the percentage of each Team.
(c) Half Time & Beyond
If the Half Time interval has been reached and the Match is
unable to proceed at any time within the time scheduled for
the Match, the Teams shall leave the Arena, or in the case of
Half Time, not return to the Arena.
If the Match is unable to recommence within a 30-minute
period, the scores of the Teams at the time the Match was
interrupted shall be deemed to be the final scores of the
Match. The Team with the highest score shall be deemed
the winner of the Match and the scores shall be used in
calculating the percentage of each Team.