I’m sorry, I don’t have a link, as I have bought this light at IDS 2019 but never found the actual producer online. The battery housing is self made - the onshape file can be accessed by the link above - you can have it printed and have @lexel make a driver that supplies 1A of power with Anduril UI which is simply great. You just need some soldering experience and some additional parts such as USB-C plugs and couplings from ebay, a battery protection PCB from an old 2S LiIo battery, brass sheet metal for contacts and some wires to put it together.
as an alternative light I highly recommend this one: Ynd-b2l5 Round Beam Dental Headlight - Buy Dental Headlight,Headlight Product on Alibaba.com
It’s not as tightly focused but I’m currently using it instead of the other one together with my selfmade battery pack since the LED got weaker after a year of daily using ist for 5-6 h and I have not yet replaced the LED.