Ross,
if you have declared:

LEDcount CON 8
and
OnTime VAR BYTE[LEDcount]
OffTime VAR BYTE[LEDcount]

that will translates to an array indexed from 0 to 7, so

OnTime(8) = PRI_HULL_LGHTS_ON_MS
OffTime(8) = PRI_HULL_LGHTS_OFF_MS

Will not result in what you expect.