When it comes to heatsink fins, air circulation plays a major role and mass is secondary as it only soaks the heat, no airflow means little heat transfer. Without ambient breeze even a small fan can make a huge difference. IMO the DX80 has a very poorly designed heatsink solution, they enclosed a finned aluminum heatsink inside the body, which makes no sense. I do hope Olight did a good job with thermals in this light and push it hard, most of their lights are stepped down way earlier than they should.