H600 + Battery + Headband = over 2.5x the weight of the Nu20.
It's lightweight for an 18650 product, but definitely a different category of torch. The upside is the high output and long runtimes it offers.
Zebralights AA headlamps are a lot closer in weight. The H52F / H52Fw with battery and headband is just under 2/3 the weight of the H600 and has a floody beam, with the option of cool white or neutral white tints. Unfortunately, there's no high CRI version anymore.
The Olight H1 Nova is also very small and light, and the few users here who have one so far have been thrilled by them, but it runs on CR123A batteries. I doubt most casual users want to pay $5 a battery in a brick and mortar store, or buy them 10 at a time online to get decent pricing.
The Fenix HL10, like any 1xAAA light, has limited output and runtimes. For up close work like gardening, it may be enough, but it wouldn't personally be my first choice if I couldn't wait for the Nu20. From Fenix, I'd probably be more inclined to recommend the HL15 or HL23, which should be comparable in weight to the Zebralight H52.
I haven't kept close track of Petzl's products recently, but most of them in the past have been non-regulated, so the output is not very consistent over the course of the battery life. That said, they work ok, are usually lightweight, are easy to use, and are affordable, so Petzl and Black Diamond have been pretty dominant in the mainstream outdoors market.
