I'm certainly not a "xxxxx" model lighthead expert, but I will share something here.... I find that split flash is VERY effective WITH ONE SPECIFICATION.... the "split" or "flashing" colors are in contrast of each other (i.e. blue/red, blue/amber, red/white)... not so much blue/white. Even if you "rob" the light head of a "full flash" with one color, you usually are replacing what would be the "off time" with another produced color. Case in point (and I'm sorry I don't have a video) is the ambulances in my hometown of Houston, Texas.... for the last few years they have had rectangular LED's on the back, about halfway up the doors, one on each side.... that split flash red/white..... this has been more effective (to me and from FF's and EMT's that I have spoken with) than anything ever. Same for a small "intersection entry" light mounted on a push bumper facing sideways (or a mirror mounted light).... I'd rather have a "constant on" from dual color than the "on/off" flash of a single color. Of course everyone's opinion is different, and I do think both have merit. I just think that with constrasting colors that can be easily discerned, the split is better in most cases.