Pinwheels and splitting heads when viewed from a distance provide absolutely NO implication of a flashing light when viewed at a distance. They merely are a dimmer, steady-burning light source as only 1/4 to 1/2 of the lighthead is illuminated at any one time. From a distance these heads cannot be distinguished as a flashing light due to their proximity. On your workbench or standing in front of whatever unit they're affixed to, they look cool but again, are completely useless at distance. To grasp the full use of and utilize the full intensity of any LED lighthead, it must be fully illuminated. Flash it or steady-burn it but use it fully. Now, that being said, that only applies to single-color heads.
Split-color heads are a different story as you would be conveying two different meanings or displaying two different colors from the same location. In that instance, then, and only then, split them according to their respective colors, again, displaying two different colors from the same location. To run both colors together on that lighthead is ludicrous. Neither color gets portrayed properly and the reasoning for the two colors gets lost. Back in the day, when using a split red/white or blue/white head, one could intensify your light output with a half-color filter to get some attention without blinding your driver in adverse-weather conditions and the use of a full-white head could be too much, especially w/ a strobe. Obviously, the white would overpower the other color but a fraction of that color would still be displayed, even though it would hardly be detectable to the naked eye. Some split-color applications were great for the front corners when viewed at "critical angles" (45 deg. to the front would display all clear for traffic-clearing and red to the rear for side/rear warning. Again, this application only when there was one light source for the split -color head, not two.
My two cents.