I took two of these lights (red and blue) to clip to my backpack while I ride my electric skateboard when the sun isn't there seems . I cut off most of the elastic waistband and sewed on new loops with D-clips on both ends. Now they can be easily installed and removed from my backpack. They are light and I don't notice them at all. I left a fully charged flashlight on for 3.5 hours and didn't wait for the battery to die. I don't know how long they last (no flashing), but >3.5 hours means I only have to charge them once a week. The only downside I found is the flashing feature of these lights. The active part of the duty cycle is very short. In other words, the off time appears to be three times longer than the on time, meaning they're not as noticeable in blinking mode. Since I'll only be using them to the full, I'm not too worried about the flashing mode. The photo attached to this review shows red and blue lights mounted on my backpack, as well as a typical bike tail light. compare brightness.
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