The Thi Lor Jor Waterfall was kind of a bonus waterfall to us because we noticed it as sort of an incidental attraction along a river journey that took us from the village of Umphang to somewhere close to the Thi Lo Su Waterfall. That river journey was a three-hour rafting trip where the falls was somewhere in the beginning quarter or third of the ride. I believe the river journey was the only way this waterfall could be seen.
In the wet season, I'd bet the weeping walls would become much more forceful rushes of water. When we went in late December, the falls were dropping gently into the river below (since it was the start of the Dry Season). The tour we were on was luckily timed well as we got to see a double rainbow in the mist of this waterfall while seeing the falls glow in the sideways morning light once we got past it and looked back at it.
There were also other smaller weeping-wall-like waterfalls along the banks of the river though we had trouble telling one waterfall from the next. In fact, it was conceivable that the falls could very well be part of the same tributary system (i.e. they were all different segments of the same waterfall!).
As for the rafting tour, it featured more than just this waterfall. In addition to the nearly pristine jungle scenery (much of this area was undeveloped), there was also a stop we made at some kind of thermal spring where it was possible to dip into the geothermally heated waters there. That stop was one of the few developed spots along the river.
I've seen this waterfall also referred to as Namtok Thilawjaw as well as Namtok Teelorjor. Once again, I believe these multiple spellings have to do with the inexact and non-standard way of trying to romanize Thai pronunciations.
In our experience, this waterfall shares the same excursion as that of Namtok Thi Lo Su. The only difference was that we put in the water from somewhere near the village of Umphang (which was also where the raft tour operator was based). The end point was near campsite at the Thi Lo Su Waterfall.
For general context, it was about 6.5 hours drive south on the Death Highway to go from Mae Sot to Umphang. Mae Sot was 351km (5 hours drive) south of Chiang Mai. Chiang Mai was roughly 700km north of Bangkok. It would take around 9 hours to drive or a little over an hour to fly between the cities.
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