FWIW, anything that can make me be seen is GOOD.

My bent came without reflectors and I added them on. But I also have blinkies mounted on the side for my night/dark rides. I have them mounted on the seat tube as that is the closest in diameter to a handlebar.

I've heard a number of comments at work from people. Generally, something like "did you see that weird bike with all those lights on it?" (I run of 3 rear blinkies - when I don't use the panniers and 5 when I do use them - each on a different blinking mode.) And usually after they find out it was me, I learn they'd seen the bike from over 1/2 mile away. Security at work can see me in the cameras from over a mile away..... makes it kinda hard to sneak in/out of work when it is dark out.

As far as the law goes, Pennsylvania requires front, rear and side reflectors. It specifies minimum distance that they can be seen from. But all of them can be replaced/substituted with appropriate colored lights as long as they meet the visibility standards.