What bulb to put in MAG 6C for best performance?

^What topic says.
I currently have a 5C/D bulb in it, a 5C Magnumstar is arriving tomorrow.

Mag Instruments is now selling Xenon bulbs. Xenon bulbs have been hard to find in brick and mortar stores, but I found some for up to four cell lights at Fryes Electronics in Houston over the weekend. I do not know how long a 5 cell xenon would last being overdriven in a 6 cell. If you do not mind dropping about $3.50 a bulb that might last 5 hours then you are good to go. I have not ben able to find any PR2 based bulbs were the filament is in line with the central axis of the bulb. These types of Belbs can give very concentrated and more uniform hotspots.

Can you ship me a couple of those with an intenses hotspot when theyre availible? I'll pay trough paypal.