I never thought the lower lumen count was a typo. The SC52 made less lumens than the original SC5 too. That's a physical constraint - boost drivers with wide voltage ranges are less efficient, so by focusing on just the one chemistry with the narrow voltage input in the SC5, they were able to really improve efficiency at the hardware level, not even a software issue (aside from maybe some smarter low voltage detection). I think the typo is in the voltage range. SURELY the SC53w will support both AA and 14500 chemistries.
But of course I could be wrong....
ZL's official reply on the whole driver/14500 debate:
""The H53/SC53/H503 driver is a slightly improved version of the H52/SC52/H502 driver. Again, if we were to put the same (bin) XM-L2 LED in the H53, we'd see some improvements there (in output and efficiency). On top of that, the new UI requires more memory space. Dropping off the 14500 support is among the very few options we had."
You can also find this quote on the H53 thread, page 6, #180:http://www.candlepowerforums.com/vb...53c-AA-Headlamp-Neutral-White-High-CRI!/page6
Since the *53 line doesn't provide enough memory space for 14500 support after the implementation of the new programmable UI, my guess is that ZL dropped the related hardware as well (hence the lower price), as evidenced by another ZL reply: "14500 support is dropped in the H53 series, compared to the H52, in order to lower the cost (and the price) a bit. High output from Eneloop/NiMH batteries in the SC5 series requires a much more sophisticated and expensive driver." (page 5, #128)