They have a perception as specialist/medical so premium is the order of the day. The prior lamps were heavy and inefficient. Newer LEDs are preferred but they

They have a perception as specialist/medical so premium is the order of the day. The prior lamps were heavy and inefficient. Newer LEDs are preferred but they are not made by that many companies, or until recently anyway. And many of the new entrants have crap longevity. Furthermore, sourcing issues compounded over COVID. There are also unique design challenges mechanically for UVC. Just some of which are efficacy is inversely proportional to distance and time, and you need 100% line of sight to have any effect at all...