How about something like this...
'Set flag whenever system is armed to away mode, either set a counter to a value or use output as a flag, example is with output 100
WHENEVER Area1 is ARMED AWAY
THEN TURN Output100 ON
'When disarmed and away mode set and dark, change lights
WHENEVER Area1 is DISARMED
AND Output100 is ON
AND IS Dark Outside
THEN
Turn Output100 OFF 'reset flag
do whatever to your lights...
So, whenever the system is armed, if it is to away mode then the flag is set (Output turned on). SO now the system knows it is armed to away mode. When the system is disarmed, if the flag is set (output on) then you know it was in Away mode, then you check to see if it is dark outside (or whatever time parameter you want) and then you reset the flag (turn output off) so armed away mode status is not set any more, then do what you want with your lights. Haven't tried it, but I think it should work.