The lights both come with everything you could possibly need. The ergonomics are solid and the design is robust. The XS is minimalistic in and of itself and takes up a negligible amount of space on the bars and produces a ton of light. ![]() The X2A is light enough, battery included, to run the entire system on the helmet. For testing purposes, I used the XS on the handlebars and the X2A on the helmet. Both lights feature a wireless remote that straps right on the handlebar with no adapters. Both the X2A and the XS lights tested here have interchangeable lenses making the set-up options incredibly versatile. Gloworm are known among many riders as "the light people." Their X2 Adventure is a smaller battery version of their X2. By no means do you need to stick with the same brand on the helmet and bars, that's just how I grouped things together. There's a Gloworm option that couples the helmet with the bar mounted unit, one with Niterider, and so-on. The lights are reviewed together for each brand, when applicable. Thermal Rollback is when a device, in this case, lights, gets hot and then lowers its output in order to decrease the operating temperature, thus preventing damage to the light, causing burns or worse. ![]() We did our best to make this easy to understand, but I'm going to guess that a number of people don't know what "Thermal Rollback" is. He has torn apart and analyzed nearly every bike light available so there's no better person to help pick apart a few lights than him. He has multiple LED chip design patents to his name, is also a mountain biker, and rides at night as much as in the day. ![]() Specifically, for seven years, he ran an R+D department at Cree - the manufacturer of LEDs used for nearly every bike light on the market, including all of the ones in this test. Because lights function differently in varying conditions and a good looking light doesn't always mean it functions well long term, I consulted and collaborated with my friend Tom 'Danger' Place, who has years of light and LED experience.
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