By pushing the versatile Zoom Reflector forward or backward on the lamp head, the spread and effect of the light can be greatly altered. Pushed all the way back (to setting 8), it gives very even lighting over a broad area. The light-spread of 100 degrees, at a distance of 6' (2m) from a wall provides completely even illumination over an area 12' (4m) in diameter. At setting 6, it provides very effective lighting in a circle, for example, properly filling an umbrella. At setting 4, it gives extremely concentrated lighting (65 degrees of light-spread) with an intense lighting effect. The difference between setting 8 and 4 is plus 3 stops.Along with its zoom feature, the Zoom Reflector accepts a variety of accessories including Grid and Filterholder, Barn Doors, Snoot, and 5°, 10° and 20° Grids for a wide range of light shaping possibilities.