Review on ZHOL® SUPER BRIGHT Vanity Mirror by Michael Reynolds

Once you receive these LED lights, mark the back (on both ends) with a dot or line. The reason for this is that, like all LED bulbs, they are current rectified, which means that the DC voltage has to flow through them in the right direction or they won't work. So if after installing a new lamp nothing still works, just flip it over and reinstall, that's why it's marked so you can tell which end is which. You must put an ending as + or -. This is a good light at a great price and is very hard to find in an auto parts store.