I've suggested it previously, it would be fairer to both teams if the game was split into 2 innings of 25 overs.

Team A bats 25 overs
Team B bats 25 overs
Team A bats its last 25 overs
Team B bats its last 25 overs

Both teams get to bat during daylight conditions, both teams get to bat during night conditions.
The team batting first still has an advantage, but not such a big advantage.
Also any calculations of the Duckworth Lewis system should be less dramatic.