Well, these might fall short of what you consider decent, but they take 20mm drivers. I’ve listed two versions in the OP of this thread: Mod: Zoomie with MT-G2
Edit: Just noticed banggood link is dead. Oh well, these lights are sold under different names here and there with small differences. Switches are not the best of quality.
Page says “backordered” but that’s been true off and on for a few years, they probably produce a few at a time.
Decently easy to mod. I’ve bought half a dozen of them or so over the last few years.
You can just fill the hole with some JBWeld and it’ll still provide a better thermal path than just air. Add Cu shavings for even better thermal properties.
“Lap” it flat when done so it makes good contact with the mcpcb, and use enough thermal ook like AS5 to fill any air-gaps, and you’re good to go.
Just adding a penny behind the pcb gives it more thermal mass, but not necessarily better thermal properties from pcb to the outside world. All the heat still would have to go from the edge of the penny to the shelf anyway; that’s the bottleneck.
With the ok 26650 Zoomie I’m dealing with, it has a hollow 20mm pill that a penny fits into perfect. I can stack about 10 before it would get in the way of the driver.
There are some nice, affordable fully regulated drivers in ∅20+mm formats, at least for the tinkerers who aren't after extreme outputs. Drivers like the LD-29, H1-A and H2-C are among my favourites.
By the way, seems to me SK98s do feature quite good heat dissipation, am I right? In theory my SK98 burns up to ≈25 - 26W (XHP50 at ≈3.6A) on high but it doesn't exactly gets hot super-fast.
I ordered a SK98 from Ali yesterday. The Supfire F3-L2 looks very promising too. It looks like it has a glass lens also.
I have 4 of the H1-A drivers. So yes light output is my goal. And I am just a tinkerer. A small Zoomie that will put out more light than a factory cheapo light.