You can log it however you want....how long were you under the hood and how much of the flight was at night. Don't think that because you were flying for 3.0 means you only can break down the 3.0. You could have 2.8 of hood time and 3.0 of night. Total is 5.8 but it was a 3.0 flight. Does this make more sense?
Illini