Almost too easy to be called modding but…
A couple 2 or 3 weeks ago while checking out a comment about an S70 clone on ebay I saw a SRK in gold with 9 emitters on the cheap. Stupid cheap, like $13 or something. So I bought one. It came today… with Lattice Bright emitters making 1683 lumens on 4 LG HE-4 button top cells. Of course I opened it up and checked it out. They had a large FET for a simple driver, no sense resistor, small pair of wires to a single aluminum mcpcb housing the 9 XM-L copycats. So I pulled the LB emitters, dug around through my ever growing pile of stuff and found 9 XM-L’s I’ve pulled from other lights an put it back together with 20 ga Turnigy leads. 1811 lumens rock solid, meter wasn’t budging. Then I remembered having a second one of Richards SRK group buy driver’s put away… so I stuck that in there in place of the simple 2 mode (w hidden strobe) driver.
Now it makes 3881 lumens in High, 1228 lumens in medium and a very miserly 0.38 lumens in Moon. With reversing switch, it’s really nice.
Perhaps later, if I remember, I can make a nice copper heat sink to assist the thick aluminum mcpcb….
Edit: 4157.25 lumens with the batteries freshly charged and an UCLp swapped in. Works for me!
Edit: Pics of the driver and mcpcb from the e-bay Sky Ray with omitted “king”. (it’s a SRK but a clone apparently, although the site showed Sky Ray King lights)