Hi. We are in the infancy stages of developing for an eventual move to lightning.  I know some people have deployed lightning to a small group of users to start out.  My question is, how do you handle one group of users viewing the lightning version and others seeing the classic version?  For example, I use a visualforce page as the account default.  I have built the lightning version of that page.  How do I go about allowing my small segment of lightning users to see the new component driven page while still allowing the users not converted to see the classic version?  Thanks!!

Fred