| Honestly if you like the window and the results it produces, I'd just get a tripod and white balance card and continue to use the window with long exposures.
 If I were to buy one light, it would either be the White Lightning x1600 or the Einstein.
 The WL x1600 has a bigger power range than the AB.  On the top end it has more power than the AB, and can be reduced down to a mere 5ws, whereas the the AB 800 only goes down to 10.  The Einstein goes down to 2.5ws, which is even less than the WL x1600.
 
 The WL and Einstein run more than a B1600, but offer more.  I think it's money better spent.  You may not need it now, but it's a good investment into your future.
 
 Other things I prefer about the WL over the AB are the 5 year warranty, the 250 watt modeling light, the housing is built like a tank, the modeling light can be adjusted independently of the flash power, faster t.1 times and better color consistency over the power range.
 
 The Einstein has three advantages the WL doesn't.  Action stopping t.1 times, good color consistency over the power range and wider power range.  It's slightly less powerful than the 1600, but it can lower the output down to 2.5ws which will help with those wide open aperture shots....however, unless you need those fast t.1 times, I'd save the 60 bucks in price difference.
 
 A WL x1600 would easily be able to handle f/2.8 either through a white plm or bounced off a white ceiling.
 
 
						    
 
 
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