text: Tried using last night for a moonlight race, with no moonlight due to clouds :). They throw light about 3-4 ft in front, nowhere near the 30 ft. I applied just like in the video on their website with the woman runner. Near the end of the 5K race, one was missing, had slipped right out without my knowledge. The road was an asphalt road but due to recent rain had twigs and moss in the path which was only lit with glow sticks on cones. The light from these helped prevent slipping or tripping and falling because of those small obstacles. I have emailed the company and requested a replacement light - just one, as I would use again for this kind of race. But I definitely will have some other lighting in addition to this for the next time, maybe a headlamp or knuckle lights or all three.