Pretty certain you are off here. I think the 4x32 LED is actually the only that doesn't have tritium (at this time.) To be more specific, most of the models are TFO (Tritium plus Fiber Optic) so the fiber optics supplement the tritium light source in brighter environments.
Notice, Trijicon lists tritium as a light source on the 1.5x24 (and most other models): TA45-2 - Trijicon, Inc.
vs the 4x32 LED: TA02 - Trijicon, Inc.
Deffinately like this model, but still dont have the money for something like this. Trijicon has it listed at 1433. Is there anywhere that sells them for less?