the only bad thing about this flashlight is that the pill has a big hole,so i added a copper 20mm star with some copper pieces solder underneath the star.
No it does not, please do not buy that light. You can get the same thing on ebay for $5 and for a bit more you can get something much better. Look at the convoy lineup for some quality lights at great prices.
When you put in a copper DTP led board / star / MCPCB it’s already much better.
Use some thermal grease where the MCPCB touches the pill and screw that retainer ring on tightly.
If you want to improve the sinking on that light starting with a quality DTP copper mcpcb like a sinkpad or noctigon as mentioned will make a big differance.
If you want to improve that pill you could just take some copper foil or aluminum foil and mash it in there very tightly with a press or a hammer and flat bar. Pound it till its hard like metal, just make sure you have enough clearance to keep from shorting out the driver board.
’98s are about 19mm inside (20mm driver!), and you can file down and stack a few Cu pennies, pre-tinned, drop them down, then heat and further pack them down to melt the solder and squoosh them together into a block. You can probably fit another shaved-down penny (and gobs of solder) into the leftover space under the star, melt that together, too.
Once done, and it’s about the same height as the ledge holding the star, you can drill holes for the wires from the driver, then reassemble the whole mess.
It’s a pain, but it works.
I asked about other methods, like filling the hole with Cu shot and solder, JB Weld, etc., if anyone ever compared the performance of each, but no one bit.