Whether you’re buying something new or updating the old, pairing a new shade with a lamp can be tricky. We’ve got a few tips for you to keep in mind while you shop for that perfect shade. Measuring tape Lamp Remember these five things: The bottom edge of the lampshade should fall midway on the neck of the lamp. You don’t want the socket or the switch to be visible. When shade shopping, the shade size refers to the width across the bottom of the shade.