Originally posted by gatorguy Reportedly a pair of AD200's in an AD-B2 twin head is more powerful than a single AD400 FWIW. Perhaps as much as a 1/3 stop more. I can't personally check as I only own the AD200's. Those on the fence on which to buy might consider that avenue instead as there's lots of upside and little to no disadvantages. You can have two separate flash units which can be darn useful or one powerful one if working outdoors under brighter lights, and you accomplish the same task as a single AD400. You might even find it's slightly cheaper too.
AD400Pro vs 2 x AD200 + AD-B2. This is a really interesting topic, that have been discused some times on the forums. Some time ago, when I had only the AD200, I was dediding a new upgrade route: what to do ? buy another AD200 + AD-B2 or the AD400Pro, maybe selling some of my older flashes, like the AD360 to finance the purchase? Usual AD400Pro price is more than double the AD200. I decided to go the 2 x AD200 route, so I bought first the AD-B2 and was happy with it, having just one AD200. AD-B2 is a more or less a good Bowens mount, and also had a led light, which was new for me. To buy another AD200 seems a logic upgrade if you own a AD200 yet, isn't it? Add another AD200 to your set and you'll have all the advantages.
But then I saw a great deal for an AD400Pro, and decided to buy it. The AD200 costs 313€ new here, and the AD400Pro costs 680€, but the neewer 'flavour' was only 413€, 'just' 100€ more that the AD200, and near the same price than the AD200Pro.
Now that I have the AD-B2 (with just one AD200) and the AD400Pro, I can (partially) compare both solutions, and IMHO, if you mostly need power, I think that the AD400Pro is a better idea compared to 2 x AD200 + AD-B2. Why?
1. AD400Pro is more compact, easy and quicker to setup compared to 2 x AD200 + AD-B2. This can or can't be a deciding factor for you.
2. Led light. AD400 have a single 30W led light, with some advanced functions. AD-B2 offers 2 x 20W led lights. Yes you have more power but some disadvantages. For example the led light eats AD200 batteries quickly, you have only 3 power positions for the AD200, and you need to control two different lights. It's quicker to setup andn control the modeling light with the AD400Pro, and you can use led light for more much time on the AD400Pro.
3. You have two mounts on the AD400: Godox and Bowens.
Of course if you plan mainly to have two lights, and ocassionally need more power on a single light, there is an advantage on the side of the AD-B2.
About price, now that the Neewer is so cheap, the advantage is on the side of the AD400Pro.
About power. I made some tests comparing AD400Pro vs AD200 + AD-B2 using the same scene, subject and diffuser, and my conclusion is that the AD200 is a bit less powerful than 'half AD400Pro'. You can see my results
here. It was not an in depth comparison, but just a hint that AD400Pro is a bit more powerfull than 2 AD200's (comparing bulbs). You can find another comparison with similar results in this youtube video
(it's in Spanish, but I think you can understand what are the guy doing), look at minute 8:59.
This is just my experience, can or can't be valid for you, as always
.
EDIT: on the test I'm referring to, I was comparing ONE AD200+AD-B2 vs ONE AD400, I expected to find half the power coming from the AD200, but got less than that.