The website had a phone number, so I called it with some questions ready.  I wound up talking to the founder, which in retrospect made sense since Luxium / Luxapel appears to be two or three guys working out of someone's garage.  But the conversation was pleasant and reasonably technical, which I always appreciate.  Later I sent some email with further questions as they'd come up, and got a reasonably coherent reply from the same fellow.  The LED units could be equipped with wireless DMX, and the claim was that in the wireless mode, the physical wired ports would act as repeaters and relay the DMX as local signal sources.  Think about that -- anywhere at least one of these units was deployed, no physical long DMX wire would in theory be needed to reach that position from the console!  This feature was quite attractive given the setup of several events I routinely work on, where cabling paths around the venues are often a bit of a design headache.

Since larger purchase quantities could bring deeper per-unit discounts, I tried to get some other par64-owning collaborators interested, but that didn't really go anywhere constructive.  The quantity I personally would need was only four, but I inquired about how to start the purchase process based on that anyway.  Then the flaws within Luxapel began to emerge, specifically that of being really disorganized from an actually-doing-business perspective.  I received a quote for way more per-unit cost than we had discussed via email, and the pricing on a wireless DMX transmitter was exactly the same number so that distinctly looked like a copy/paste typo.  We were also trying to work out how I could test various optical diffusion media kits they could offer, and figure pricing for that.  Back and forth some more, and finally on the *third* emailed PDF quote they seemed to actually get it right.  Almost.

But at least the buying process had been launched -- they asked for half the total up front, and accepted Paypal which I had finally and grudgingly set myself up with.  The shipment showed up about a week later, except minus the wireless DMX transmitter, so to begin testing I would have to take apart at least one unit and pull out its wireless receiver to enable the RJ45 wired DMX ports to receive from a controller.  [More on this particular travesty below.]

Here's the emitter matrix: separate red, green, blue, lime, and white, as opposed to multi-output chips like in the Rokboxes.  Each LED chip on the output board has basically 180 degree emission, which is all caught by a lenslet that sends it into a roughly 20-degree beam.  The white emitters produce a surprisingly warm color temperature, more like that of the par lamps these are intended to replace than the cold blue-whites we normally expect from white broadband phosphor emitters.  The units normally occupy 4 DMX slots, so we don't directly control the lime emitters -- they come on automatically at an appropriate level to augment the spectrum between red and green.

Dimming is very smooth, with no evidence of "quantization" or flicker in the output, especially where it tends to be most noticeable at the bottom in other LED fixtures.

With two stages of gentle diffusion -- one on the module standoffs inside the par-can and then something more across the gel slot, output can be made decently uniform without objectionable edge fringing.  And the throw for this testing was only modest residential ceiling height, so it would be better at real stage distances.

I actually made the first one of these early on, and then converted male-to-male via XLR to temporarily use the RJ45 as input when the W-DMX module was out.  Unfortunately there's no easy external way to switch that functionality in the Primo module -- if the W-DMX daughterboard is in, the RJ45 is hard-set as an output that actively messes with any DMX line plugged into it.  The fellow from Luxapel seemed to believe that un-pairing would revert the ports to high-impedance input mode, but such is not the case.  We discussed; I think wound up sending him into a bit of a re-design project.

Here's more confirmation that the SD50 only sends 48-slot DMX frames, too.

To somewhat re-create the traditional oval beam of MFL and WFL par lamps, I also cut some *circular* 10" pieces of Rosco 113 silk, which could be rotated to arbitrary orientations in a gel frame.  Not perfect, but does visibly spread in one axis.

This terminator [blue arrow] is basically a 100 ohm resistor in series with a red/green bi-color LED, and the running differential RS485 signal is usually enough to flicker the red/green outputs in a characteristic way.  But from a couple of the Primo units, that output looked "weak".