Why not DIY, the 100W black fins just fit (really just fit, at an angle), the 5.5AH can power it (really just barely powers it).
I just measured, its 8.1A 12.15V input with a 12V 7AH. With the OEM host of the Yao with 12V 5.5AH it is 12.08V 7.9A. So that's about 80W to the bulb too.
You can play with 100W, 75W and 55W bulbs. They are cheap, the 55W bulbs throw like crazy due to short arc length. The 100W bulbs are noticeably floodier. 2 ballasts, 2 bulbs, 1 host, everything shipped, just a wee bit below usd200.
Extra bulb/ballast can go into a Thor X Colossus. Then you get 200W light.
If you are really handy, there are dual power ballasts as well. So basically its "the same".
Perhaps...you don't even have to mod. The stock 55W ballasts that they gave me, took 5.9A, 12.2V. That's about 60W to the bulb. Crazy. My 75W ballasts are delivering 57W to the bulb. Don't ask me why, there are always variations with these kind of stuff. So that's $100 delivered, if you want this host/light. I figured you know the original price of the Yao, and the alibaba distributor is not answering emails.
Later you can try morepower! 's mod, to squeeze more power out. (but then they will really be pocket rockets).
Blowing too many bulbs? Spare bulbs are about usd14 delivered for the 55W per pair. For 42 bucks you can have 6 bulbs, rainbow colour. Golden yellow, dark blue, purple, 4300k, 5000k, 30000k. Maybe add another pair of 4300K for standby.