I bought the cheap Chinese set: https://www.amazon.com/gp/product/B00YG8OALW/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1 and had to return it because one of the lights was dead. I gave in and bought the Cygolite Metro 550. It's fabulous. My neighbors thought I was on a motorcycle.