Similar to the original LM-1, Luma-1 is a very complex machine. It has a dual CPU architecture (Z80 + ARM) and makes no compromises with the audio path. Luma-1 uses the original nine individual DAC chips, and the original “loose” clock generation scheme. The DACs are no longer produced, and must be obtained from surplus stock suppliers.
The digital sections are identical, but Luma-1 uses small SMD (Surface Mount Device) components to save space. A modular design was implemented, where each voice is on its own card for serviceability and future expansion or modifiability.
The power supply is the exact same model used in the LM-1, and amazingly it is still made in the USA! It is a linear power supply, which is heavier and more expensive, but doesn’t have any “switching noise” concerns of more modern supplies.

Luma-1 uses a Z-80 just like the original LM-1, and runs the Rev 3 LM-1 firmware. It has the same loose sample rate and tempo clock generation, 9x (one per voice) 8-bit µ-law DACs, OpAmps, and AS3320 (or CEM3320) filters on the Conga/Tom and Bass voices. Unlike the original, the filter cutoff controls are externally accessible.
In other words, the entire audio signal path is identical to the LM-1.
On the digital side, the samples are not stored in EPROMs, but rather individual per-voice RAM chips. Drum samples are loaded into those RAM chips either from an internal SD Card or by downloading via SysEx. That allows for hot-swappable sample storage, whether it's the original bit patterns of the LM-1 voice EPROMs, other sample-based drum machines (such as the DMX or DrumTraks), or totally new sounds. Samples can be 2KB, 4KB, 8KB, or 32KB in size, allowing a wide variety of vintage and new sounds to be loaded. (Note: due to the way the Conga/Tom voices work, those samples can be 2KB, 4KB, 8KB, or 16KB.)