A de-domed XP-G2 4C, yes I said 4C. I like warm light, I maybe should have used a 3C since it is a bit yellow.
Warm is ok with some of my lights but in a thrower I prefer to have a neutral if I can end up with that, just my personal preference.
Excellent work on these mods! Small Sun's can be a challenge - the quality and consistency is somewhat lacking, but it's all work-able. I bought a T43 for modding, but ended up a total disaster - not simple modding at all - stripped out the threading, etc.
I use purchased copper discs in various thickness's so try to work out the vertical spacing in advance but it's not always easy. Generally on the bigger lights that use 25 mm stock MCPCB's you are replacing 2.0 mm MCPCB's with 1.6 mm copper MCPCB's so you start out going in the wrong direction from where you want to be. I really like the 26 mm Maxtoch MCPCB's but they are costly, and still too thin.
I'll reflow the copper spacer to the MCPCB so it's one solid chunk of heat sink, which helps.
Thanks Tom. I have a Zy-T43 in there with stripped threads too, hahaha……the threads came out with the head when trying to take it apart so there it sits.
Thanks for the rest of the info also, I will be putting this in my knowledge bank for future reference.
You will have to let me know where to get those copper disk though , that would save about and hour of time trying to make one as I did.
Great work, a couple of nice lights you have there.
I wish I had more open space nearby to let my throwers stretch their legs, all woods and hills around here.
Thanks, we have a lot of woods around but also a lot of cattle/ranches also , so we have a good mix of both open and wooded.
Very nice mods and thanks for showing us.
Thanks MRsDNF and YW
Nice work. Simple, yet effective is my style 
Thanks Lotus_Darkrose yes simple is definitely the eaisiest way to do things usually and my preferred method also.