I think the main competitors in the field right now are the wizard series from Armytek, H600 series from Zebralight, and the SG6 series from Spark.
Most other offerings are either lacking proper low modes for a headlamp, or lacking a neutral or warm emitter option, or are too heavy, or some combination of issues.
Of the bunch listed above, I think Armytek's TIR lumen management beats everything else, but that's a subjective option.... My main reasoning though, is that, bare emitter lights are very high glare for on-lookers, making them terrible for use around anyone while working or camping. They also require the use of higher output modes to reach the same visual acuity on a subject, as there is just NO lumen management at all, so many lumens wasted to unnecessarily wide "spill" everywhere. . Flood achieved via a frosted lens over a reflector is better, but also produces higher than ideal glare for on-lookers, as the light "source" is now the lens itself. Here again, if you're in front of it, you're seeing darn near the full brunt of glare possible. Lastly, the Wizards implementation of a TIR actually "controls" lumens into a functional near-field narrow flood light, so high glare is constrained to the wide beam pattern, the "spill" beam is far less intense, meaning, you can point the light at your subject, like say, a stove you are running to cook a meal at camp, without blinding everyone positioned facing what would be your "front hemisphere." Of course, then there are traditional reflector headlamps, which I would consider largely obsolete with the output possible on modern emitters from li-ion power, as they cause very narrow tunnel vision in actual use in dark environments, which can cause unnecessary disorientation and clumsiness. At this point, I would only use a traditional reflector headlamp for situations where the headlamp is being forced to compete with strong ambient lighting, thus, requiring very high lux on a subject to bring it up to the competing levels that my eyes are adjusted to... for example, working in an electrical box, in a barn or shed with sunlight coming in from a side-angle. For all intents and purposes, my eyes would be adjusted for sunlight, but the box is in dark shadow. For that I'm going to need to concentrate the lumens to compete with the sun. The wizard might manage but would have to be in high or max mode. Headlamps with reflectors typically offer ~3-4X the peak lux, thus, would be much better. Tunnel vision is less of an issue here, as we're already dealing with contrast issues in the environment anyway.
