Exposure Lights Sirius MK10 Daybright Front Bike Light

Product Information

Exposure does list the basic numbers. This light puts out 1600 lumens at full power and has a 10,200 mAh Li-Ion battery that will sustain it for two hours at that power level. From there, the key statement is "Burn time and lumen output are directly proportional, if you double the run time, you halve the lumen output." That's your guidance for figuring out what you get across the seven programs that feature a mix of three, and sometimes two, power levels.

Exposure Sirius Mk10 the ultimate “to be seen” front light, now with the output increased to 900 lumens to light the road ahead in the dark nights. The Sirius hits the sweet spot for power to weight, housed in a CNC machined aluminium body that features 240° front and side illumination giving the flexibility to be used for the daily commute or longer rides. What about the actual light quality though? The road-specific beam pattern on the Strada uses two different beams that combine. One is a typical round shape that stays centred without much width. The other has a letterbox shape that extends much farther from the centre. The effect of the two combined is a letterbox with a bright centre. The cutoff at the top and bottom is fairly sharp and the design is symmetrical so it works no matter which way up the light is mounted. Quality Exposure Sirius MK10 Front Light with DayBright will last much longer and perform better than their cheaper counterparts. They are typically made with higher quality materials and are designed to withstand the wear and tear that comes with regular use. Investing in a high-quality Exposure Sirius MK10 Front Light with DayBright means that you won’t have to replace it as frequently, saving you money.

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I've never felt like I've needed any more light for the commute than the Sirius offers. You get good side visibility too, courtesy of a lens that extends well forward of the body of the light, a hood in the aluminium casing preventing any of that light shining up into your eyes. On the other hand, I would want a wider beam for a fast training ride out in the lanes, for which the Sirius isn't intended. That doesn't mean it's perfect though. Although the DC power port works, there's no need for it. It's entirely possible to create a sealed connection with a USB-C cable and save everyone the hassle of dealing with something that isn't as common. As well thought out as the rest of the light is, requiring adapters doesn't make the same sense. The same basic thinking goes for the burn time vs power discussion. I did the research and helped you with the maths so that we can both understand how to calculate the desired runtime vs power. It doesn't make a ton of sense to require that though, Exposure could test the light and publish a burn time chart saving a bit of hassle. Various programs in the lights can easily be selected to offer a choice of run times and modes so you can find the right one for your ride, be it an all-night adventure or an intense blast. ITM

You can see the two different types of lights Exposure uses for the road beam pattern and you can also see the sensor for headlights in the bottom right (Image credit: Josh Ross) Rear lighting that flares up automatically under braking. It can also intelligently adapt to the surrounding ambient light conditions to maintain maximum contrast and visibility, for example brightening for street lit areas and moving into sunlight from shade. Fuel Gauge Burn time for the power is good but not the best and not using USB-C for the connections makes it harder than it needs to be.

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The lens of the Exposure Sirius Mk9 Daybright bike light focuses the beam into a super bright spot that over shines all other similar lights when compared. This is surrounded by a good spread of light on the peripheral to enhance road and hazard perception, while also delivering excellent side visibility. The Sirius from Exposure Lights the ultimate “to be seen” front light, now with the output increased to 900 lumens to light the road ahead in the dark nights. The Sirius hits the sweet spot for power to weight, housed in a CNC machined aluminium body that features 240° front and side illumination giving the flexibility to be used for the daily commute or longer rides. Thanks to Exposure's Optimised Mode Selector (OMS), all of these settings are customisable; that's to say, you can extend run-times by reducing the lumens.