What is the difference between F1 and F2 Modes? Current USA - Support October 12, 2016 22:43 Updated Follow F1 = 15 minute ramp up/15 minute dim down F2 = Instant on/off Related articles What is the recommended schedule for turning lights on and off? What does it means when my Orbit LED is blinking or my controller is blinking on/off? How do I program the Single Ramp Timer? When I put my light into a dynamic mode (like cloud cover or storms), it blinks Satellite Freshwater LED Manuals Comments 0 comments Please sign in to leave a comment.