Well done XXX-Man, a good old C8 mod! :-)
I swapped the led of my new Thrunite TH20 headlamp. I got the lamp for under 30 dollars in a Gearbest flash deal lately, well not that 'flash' because the link from the Gearbest deals thread up to now gives the discounted price :-)
I absolutely think it is the best head lamp you can get atm: it looks good (for a head lamp that is), it is small and lightweight, it feels very comfortable on the head,works on all AA-size cells, gives a good output and runtime even on an Eneloop cell, the tiny OP-reflector gives it a wide diffuse hotspot that is made for close-up work, great user interface with ramping and direct access to moon and high etc. etc.
I got the neutral white version but for a head lamp it was still too cool for my taste. I had a nice U5 7A3 80 CRI XP-L (3000K) from intl-outdoor sitting in the parts box for ages so that was to be the swap. The parts:
The white part is a bezel tool that I made from a plank holder. I made it because with my needlenose pliers I could not open up the bezel and even scratched it a bit :-( . This tool got it open nice and clean, there was no thread-lock, it was just screwed in tight.
There you go, here's how the ledboard looks like, a dedicated little copper board that appeared to be DTP.
With the ledboard removed you can see that it sits on top of a groove that actually is the battery compartment, this is a tight design :-) . The thermal paste looks a lot like Arctic Silver.
I reflowed the new led and assembled the light without problems. and now the headlight emits a cosy warmish light that is to my liking, at high on a freshly charged Eneloop @30 seconds I measure 215 lumen (so a bit lower than stock), it is great for camping and reading books.