Godox confirmed to me that the new Godox Lux Senior Retro camera flash is compatible with Pentax cameras:
| Model | Lux Senior | 
| GN (1/1 level) | GN14(ISO100, in meters) | 
| Lithium battery | 3.7V 1700mAh | 
| Input Parameter | 5V ⎓ 2A | 
| Flash power | 7 levels: 1/1-1/64 | 
| CCT | 6000K ± 200K | 
| Focal length | 28mm (fixed value) | 
| Panel display | Power: Full, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64 | 
| Aperture: F2-16 | |
| Distance: 0.5m, 0.7m, 1m, 1.5m, 2m, 3m, 4m | |
| Auto f2.8 ISO100 (default value in A auto flash mode) | |
| Optical flash | S1 optical control / S2 optical control | 
| Working environment temperature | -10℃~50℃ | 
| Recycle time (Max. level) | <3S | 
| Full power flash times (1/1 level) | 150 times | 
| Battery charging temperature range | 0℃-60℃ | 
| SYNC | Hotshoe, SYNC cable | 
| Dimension | 84mm*114mm*176mm | 
| Net weight | 227g | 
Via PhotoRumors