I’m really impressed with this light. Mine has the NICEST neutral tint to it. I mean its NICE. Overall quality is top notch and its plent bright, though its also not setting any records there. Overall I rate it an A+ as a handlebar light for road/commuting/path riding. Would be adequate for trails with a good helmet light but I’d prefer something with a floodier, less shaped beam. Can fit 21700 but mine came with an 18650.
Can’t really compare it to anything modern, back when I used to night trail ride I was using a Cateye Tripleshot modded with SSC P4 U2 leds and it was the cat’s arse. These days, a couple hundred lumens is more than enough as I’m either on a railtrail (paved) or running up to the grocery store if I’m riding after dark.
I have had good luck using a twofish block on my helmet with a tube style light for many years. I actually really like a 1AA form for this reason but am slowly accepting the benefits of 18650 despite the heavier weight. Back in the day I ran a Fenix L1Tv2 for a LONG time. Now it would likely be the Jaxman E3 for a 1AA size or my Convoy S2+ sst20/OP for 18650. Of course, the options are almost endless as virtually any flashlight will work with a twofish. I did build a 18500 light kind with this application in mind but it turned out heavier than an S2+ so no gain there. The Jaxman E2L does have an 18500 battery tube available, so there is some possibility there…