run-time
Oh, and run-time on 2700mAh batteries is about 2 hours, with a slightly noticeable dimming after an hour, and realistically becoming unuseable as a beam after about 1.5h.
The shots in the pics were taken after I’d probably been riding for about 30 mins, so they are slightly down, but ultimately they’re not quite as bright as say a fenix L2D premium, but for £10 a pop, who cares. I tend to run 2 on my crash helmet, using one until the beam starts to dim, and then switching them both on – can ride off-road for 2 hours at night with just that.