I have a constant issue with north-facing homes. This must be a big challenge for every real estate photographer. It takes a perfectly partly cloudy day to get the natural diffusion to look good naturally. Sure, there are ways to artistically blend multiple exposures in post-processing, but I want to find a reasonably-priced flash with a very wide broadcast of diffuse light; and one that is very easy to set up and remove in a timely manner. So, my question is this: What company offers an inexpensive and reliable but very powerful flash with a broad angle of illumination?
I seriously doubt that you will find a large powerful broad angle flash that will light the exterior of a property without you having to composite multiple shots. Here are some large powerful flashes that are easy to move around and hand-hold that have been recommended by readers:
All of these are a few hundred dollars and easy to handle but for the whole exterior of a home, I think you will need to walk around and light various sections of the exterior of the home and then blend the multiple exposures together in a Mike Kelley style technique.
Actually, the Mike Kelley style would probably look very nice but it will take extra time both on-site and in post-processing. I doubt there's a quick and easy answer for what you want to do other than spending some time in Lightroom pulling out a brighter image of a RAW file.