Its compact 5" diameter makes it great for location work and its 130 degree coverage is nice for lighting backgrounds. Output gain is 1/2-stop over bare bulb. Includes an RP-1 Diffusion Dome which softens the light and integrates the flashtube and modeling lamp for accurate previewing. This is especially handy when using barn doors, grids and snoots. What you see with the modeling light is precisely what you get with the flash. Coverage is 130 degrees.