I just bought these items for my kids bike. He's 12 but has to ride at night on what I consider a dangerous road between our house and his grandmother.
After I installed these kits, I had him ride this road and I followed first then reversed and approached him from the front side.
If you love your kids, have a look at these. While I used YELLOW on a black frame bike for daytime conspicuity, you can use similar color for a stealth look but night reflective. The company streetglo suggested two kits, and that's what I put on. The wheel reflectors worked fine but if you have rim brakes you'll have to be creative...
The reflective gloves were a nice addition and I could see these for a mile away when approaching him.
I didn't remove any of the legal reflectors, just added these and the results were better than I had hoped for.