Well, my Dorcy PR drop-ins arrived yesterday, and indeed, they are Lux I emitters, but it doesn't look like the TerraLux TLE-1F:
It has the same Lux I emitter, but doesn't have the metal "cap" covering the wires to the emitter. Tried to find a pic to post here as reference, but can't find one and don't have the bulb handy to take a pic.
My Nite-Ize module looks just like the TerraLux, but as I posted earlier, uses some other emitter (unknown) in place of the Lux I.
Nevertheless, the Dorcy modules work equally well in my 2xAA Dorcy and Ace lights with the faceted reflectors. Nice throw, very smooth beam, and nice spill. I'll compare the Dorcy vs. Nite-Ize back to back this weekend, but they appear pretty close in lumen output. I'll also try the Dorcy in my incand. 2D Mag and see how it works compared to the Nite-Ize. I'd expect similar results across the board.
Chris