Modulator lights have actually shown to be more difficult for people to gauge your distance. Often mistakenly thinking you were farther than you actually were.
I follow the guidelines of more lights, contrasting helmet/gear/bike colors, and defensive riding. My rule for defensive riding is 2fold: 1. No one cares about you and your puny 500 lb bike, ride accordingly. 2. If you're reacting to a situation, you're already too late. Be proactive.
So keep your head on a swivel at all times, and be constantly gauging at least 2 different actions everyone around you could do and be prepared as if it'll actually happen. Yes it's a lot of brain power, but you get used to it. Being Deaf, all my information is visual and vital. It's certainly not like driving. If you find yourself zoning or spacing out, you're not paying attention. One technique I use to practice is when I'm scanning my environment, I'll ask myself things like "what's the color of the 3rd car behind me and the next lane over?", "how many people are in the vehicle 6 vehicles ahead of me?", or what was the make and model of the vehicle 2 cars ahead and the next lane over?" If I cannot answer the question or get it wrong, I need to pay closer attention!
Other people are not responsible for you, you are. Ride accordingly.
No one cares about you, ride accordingly.
No one cares if you are in the right or have the legal right of way, ride accordingly.
No one sees you, ride accordingly.
Etc., ride accordingly.