Sorry about reviving the thread, but anyways, I still have the modified Cyclops Thor Colossus for over 7 years, this time with the 39 Watts ceramic metal halide bulb (4,200 Kelvin version installed at the moment) which I have been using this setup for a year recently, no issues so far except for the fact that it's not as easy to restart when very hot, and I upgraded from Kensun ballast to Hylux A2088 ballast which is expensive but much better than the original ballast I used, especially with the CMH bulbs.
Plus, if you still have the Cyclops Thor spotlight with HID kit, but not sure if you shall replace the Lead-acid batteries in it with Lithium-ion battery, definitely do it! On my current 35 - 39 Watts CMH setup, I got 1 1/2 hours or longer of operation on 6.6 Amps hour Lithium Iron Phosphate battery pack depending on how much time I turn the spotlight on, on a single charge as ignition and warmup consume the most juice. So yes, totally worth the battery upgrade.
* EDITED: Added a few more pictures.