Create a Spotlight Effect?

In the Develop module, click on the Radial Filter up in the toolbar (right under the Histogram panel, in the right side Panels area) and then double-click on the word “Effect” in the options panel below it to reset all the sliders to zero. Drag the Exposure slider quite a bit to the left to darken the overall exposure, then at the bottom of the panel, make sure the Invert Mask checkbox is turned off. Now, click in the center of the area where you want your dramatic spotlight to fall and drag outward. Stop dragging at the size you want your spotlight to be. You can increase the Feather amount to make the edges softer, and you can make the shape more of an oval, if you like, by clicking on a point at the top, bottom, or sides and just pulling out (or pushing inward). If it’s not exactly where you want it, you can click inside the oval and drag it wherever you like on your image. To rotate the oval, move your cursor just outside the oval and your cursor will change into a two-headed arrow, then just click-and-drag in the direction you want your oval to rotate.