Ok, I measured my Dongrui All-920 this morning and I got about a 20cm hotspot as well at 3m. Interesting since my Dongrui is just a standard C8 (42mm) sized head/reflector. The reflector in mine is aluminum, but I don't think the pill is solid (haven't verified though). I have run mine just fine for 5 to 10 minutes at a time. The description of yours sounds exactly like mine - no ringiness at all, and a very nice defined well-focused hotspot. I do like the styling of the Jacob A60 better though.