A spotlight's brightness—the factor many people consider most important in choosing a light—is usually measured in lumens. By definition, a lumen is "a unit of luminous flux in the International System of Units, that is equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions." While that might not be very helpful, just know that the higher the lumens, the brighter the light's beam. On spotlights, the lumen rating is usually expressed by the light itself and by the light bulbs used. In general, the higher the lumen rating, the higher price you'll pay. Note, however, that brighter isn't always better. If you want to see something clearly at a very long distance, a very bright flashlight is best for you. But really bright lights can make other chores more difficult. For instance, when blood trailing a deer, a light that is too bright can make everything it is shined on look washed out, making the blood drops visible than it would be with a dimmer light.