Originally Posted by
Clyde1820
...Mounting one unit at seatpost and setting to a steady+pulse works well for keeping the red light on; while mounting the second unit on the seat stay lower down with a much brighter and more-random pulsing....
My impression from observing the lights of other cyclists is that having a steady light and a pulsing light on a bike reduces the visibility of the pulsing light, and of the bike. Better to have two pulsing lights. A steady light on a bike can blend in with background lights and be almost invisible. Random pulsing seems the most visible.