I have a pair of the Godox Witstro AD360s or equivalent - there's a whole lot of these being sold under different names - there was a Calumet Genesis version, and there's the Godox/Flashpoint/Neewer/Bolt/at least one other versions currently on the market (mine are a Calumet Genesis GF400 and a Neewer Witstro 360). They are exactly the same unit - I have a Bolt battery, a Neewer battery with larger capacity, a Bolt wireless transmitter/receiver and yet another wireless receiver/transmitter from some other brand I don't recall at the moment. They're BIG, they don't do TTL (that I recall- there MAY be a module that lets them do TTL for Canon/Nikon), but they have a ton of power, they're very solid and reliable, and with the external batteries they last all day and all night even with heavy shooting. I used one of mine on a shoot where we were in a very dark pool hall, so they were popping at perhaps 1/2 power, over 300 exposures and barely a dent in the battery. With the wireless transmitter/receiver sets, you can adjust power output from the camera position, so they're easy to tweak up and down. They have enough oomph (roughly 400 w/s) to get f/11 at ISO 200 out of a 6' umbrella softbox at 6' .
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