This Norman 811800 5" Reflector 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 barndoors, grids and snoots. What you see with the modeling light is precisely what you get with the flash. Coverage is 130 degrees. It requires fan cooling if quartz modeling is utilized. Used with the following lampheads; LH500, LH500+, LH2000, LH2400, and LH4000.