I've said it so many times here on my blog and in all my workshops!  I go out daily without the need of foundation as long as I have a good concealer and a face powder to set!  That said, I have finished so many brands and types of concealers over a decade and there are just a few that I can say --- really works!  
When I got myself Happy Skin Bye Bye, Blues Brightening Concealer Wand during the Festival of Colors Collection Launch, I wasn't that impressed with the capacity of a concealer to "brighten" at the same time cover undereye darkness!  I mean, you can choose only ONE right?  Either a concealer can "correct" your undereye circles or acts as an undereye "highlighter" to brighten the area.... multiple choice question...choose only ONE.
But with Happy Skin, I can finally say, there is an option 3 --- ALL OF THE ABOVE!
The Bye Bye, Blues concealer comes in 2 shades --- Light and Medium.  As always, I go with my gut-feel and went for "Medium" even if my fellow Beauty Bloggers would probably raise their eyebrows on me!  But yes, I need a medium because that is HOW DARK my undereye circles are!
Product Description + Ingredients