Wildemon, Ahhhh... I didn't see the HQI part. The XM double ended bulbs are typically sold under the model name "XDE", which upon quick inspection led me to believe all the Power Buy bulbs were Mogul base bulbs.
With that said, despite the beautiful coloring from these bulbs, the XDE or (XM "HQI") bulbs are reportedly not reliably firing on IceCap ballasts. Since I have IceCap ballasts, I'm a little leary of trying them. Perhaps Doug can do his own testing and see what he comes up with, although if IceCap is admitting there are problems, it's probably futile to do more testing.
For more info see:
RC IceCap Sponsor Forum 1
and
RC IceCap Sponsor Forum 2
So, back to the question, anyone use the "new"
Hamilton Double Ended 14K lamps
They are on sale for $69.95