The Sirius front light's slim casing packs 360 lumens and it has a very focused beam that will reach out to over 10m, with piercing luminosity.
This beam has a wide, even spread, although if you aim the light to achieve the best distance, you do get a dark patch of 2m in front of the bike, with less peripheral coverage in this area.
Medium power is bright enough for dark roads, and low isn't much dimmer, but the light doesn't have any real side visibility.
The fitting wasn't particularly secure – we found the Sirius moved on the bar when we pressed the button with just one hand.
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