Not saying this is for everyone as not very scientific but I use the set-up below for Superfly. Hide construct, add BB's envsphere. Download image from HDRI Haven - eg Waterbuck trail. Set-up nodes below and add HDR image into EnvironmentTexture node. Set emission strength to 1 and Bright/Contrast levels to zero (both nodes). Turn off all lights and try test render. If too dark then increase Emission to get approx levels ( normally in range 1- 5) and then use the Bright/Contrast to set contrast (normally in range 0 - 0.5 range). There is a seperate channel for lighting and background image and then basically operate in chimp mode until happy. I suggest trying out several hdr images to see which works best with the materials/atmosphere you want to create. From a post at RDNA but I forgot who it came from so apologies for no credit.