Imma say either the haikelite mto7s buffalo 5000 lumens like 900 meters of throw. 4s driver so it always has enough voltage to provide 5000 lumens until batteries are discharge. Or mentioned above the mf02 throws further then you can see at 2000+ lumens.
Also mentioned above is the convoy l2 I built one a few weeks back with the mtn buck driver with the coilcraft upgrade,spring bypasses, dedomed xpl v6 1a and 6 amp buck driver. I kept mine in the 2 series configuration. Thing is bright as hell. And shines further then I can see. The beam is tight and opens up nicely over a few hundred yards. For even more could go with the dedomed xpg2 for a real pencil beam. But the xpl beam is more then tight enough for my uses. 600 yards it can do with its eyes closed. But for the money it takes to build that. The mf02 is 80 dollars and the haikelite is 55. With the discount code the buffalo and mf02 are hard to beat for a out the box light.
Also wanted to mention if you didn’t know. When a light says 600 yards of throw it means to. .25 Lux or what moonlight is. It’s a good rule of thumb to take that number and divide by half if you want usable light it may light up a reflector or put some light out at 500 yards but you probably won’t be able to make it out. If you want to actually see 600 yards I’d go with something around 1000 yards of throw roughly