Some of the "motormen" (LEO's on motorcycles) here in south Florida used the constantly-changing beam headlight modulators. They used them in daylight only, of course. I've never used them but I think it's a good way to make yourself more-visible.
One of the most-simple ways to make yourself more-visible is to use a solid-white helmet. You would be surprised at what a difference the color of your helmet makes. Of course, someone who doesn't care about you as a motorcyclist isn't going to act differently because of your helmet's color, but it does provide contrast to your background. That may be enough to stir out of their cellphone-checking habits the Millennial who has to constantly check their social media status, even while they are driving a 5,000 lb SUV. :confused2:
"Oh, am I already drifting from my lane, into the next one, where a motorcycle is?" That situation probably won't be affected by your helmet's color, but the white helmet worn perhaps by you, coming from the opposite direction, and approaching an intersection where the SUV is intending to turn left in-front of you, will possibly see your white helmet more-readily than that spiffy black helmet.
http://www.motorcyclistonline.com/study-bright-colors-save-lots-motorcyclists-lives
Here's a chart from the research cited in the above link:
http://www.bmj.com/content/328/7444/857.full
In this study, which also looks at bright clothing colors vs. dark clothing, the difference in visibility related to accidents is nowhere near as-profound as it is where the deciding factor is helmet color. Simply-put, the #1 easiest way to reduce your likelihood of being involved in an accident by this study's figure of 24%, is to wear a white or highly-visible helmet color. This is even more-effective than a bright color of upper-body clothing.
Dr. Harry Hurt's report mentions the effectiveness of modulators (published in 1981), that's a fairly old study, it would be of interest to see about the issue in a current study.
http://www.nhtsa.gov/people/injury/pedbimot/motorcycle/00-NHT-212-motorcycle/motorcycle49-50.html This is from the Federal DOT NHTSA site.
Here's an interesting tale from a NY motorcyclist who was ticketed for using a headlight modulator, took it to court, and beat it, because state law cannot take the place of federal law in situations like this (allowed safety equipment and vehicle lighting).
http://www.zenreich.com/ZenWeb/motorcycle/headlightmodulator.htm The DOT-NHTSA link prior makes specific reference to this issue:
" Headlight modulators are federally regulated lighting devices and as such, all state laws governing them are preempted."