Here's a cute litte Visioneering F14T12 strip I found at a salvage place today. The original ballast was a LPF Lumi-Kon which I replaced with this HPF Advance.
Yep it's 15" long, anyway this ballast does get a bit warm but it's still cool to the touch. The ballast is actually the same size as a regular 4' HPF ballast.