Kinda cool there's a book on LED lighting!

I use a LED growlight panel http://www.ebay.com/itm/370526616178 to augment my other lights. It's a little cool for white balance, but that's not important for B&W. The Fancier panel would be a step up and I'd consider it if I needed more light or did color or video. That sort of stuff is used for news video all the time.

The photo below, on the left I used my LED panel and a CFL/aluminum dish. On the right (in front of the piano) I have a translucent umbrella up high with a white lighting flash just using the modeling light. No x-sync, so I had to stick with "hot" lights. 1/30s at f4 on iso400 8x10 film.