ITM: Patented circuitry within the light will reduce power to the LEDs, if they go beyond the optimum temperature, keeping the light as efficient as possible to maximise output and battery capacity. Once the light has cooled, the power is automatically restored. Like most of Exposure's lights, the Sirius has an anodised 6063 aluminium casing. Drop it and you might scratch the finish but you're unlikely to cause any damage that's going to affect the function. It really is ruff 'n' tuff. The light has an IPX6 rating, meaning that water won't get inside during normal use. 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. The complex lower optic gives a really good spread of broad distortion- and shadow-free light from the front wheel out to where it blends smoothly with the spot too. That gives plenty of roadside context and ‘corner look around’ if things get twisty. The lowest power setting in each mode only uses the lower LED to prevent the spot from potentially dazzling drivers, too. Alternatively, the Strada MK10 Aktiv has a light sensor that automatically dims the light as soon as it senses oncoming traffic. Day Bright: Bespoke pulse pattern designed for daylight use which is more conspicuous than a regular pulse and visible over a kilometre away, even in the brightest conditions. DayBright mode will you noticed. Be Seen be Safe

With an increased output to 900 watts, the Exposure Lights Sirius Mk10 Daybright Front Light has gone from being a favourite 'to be seen' light to a 'to see' option, making it ideal for darker country lanes. Constructed from CNC machined aluminium and with an IP65 water rating, this light is tough, durable, and reliable in all conditions. Visibility extends to the sides, with 240° illumination making sure vehicles approaching from the front and from an angle are fully aware of your presence. 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. 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 Smart Port+ Technology - Smart Port+ enables the charge port to accept auxiliary accessories such as rear lights, remote switches, Support Cells and use your light as a power bank to charge USB devices.Exposure's Sirius MK7 Daybright is an easy-to-use light that's suitable for commuting – and more – and for getting you noticed in daylight. Various different programs allow you to choose the balance between brightness and run-time that best suits your needs, and the overall build standard is very high. All applicable customs and import duties and any other charges are the responsibility of the customer.

The light has a 7-hour battery charge time and a maximum run time of 36 hours, depending on the mode selected, and there's a fuel gauge to alert you to the remaining battery level so you don't get caught out. In the box The OLED display that gives you mode, run time and recharge information (Image credit: Guy Kesteven)When not in Reflex programme one, I found programme four was the most suitable for my needs. In programme four on the high setting I managed to get 2 hours 40 minutes of run-time, a full 40 minutes longer than the light’s claimed endurance. A long press of the button engages the Daybright flash mode, recommended for daytime running, a setting that harnesses the full 850 lumens and is hard to miss even from a significant distance. The best bike light?