I bought them in packs of 10 and mounted them on the bike trunk. I have 3 on each side and 4 on the back. It improved my vision A LOT - especially at night! These LED lights are pretty bright and you can see them clearly during the day. That's exactly what I wanted for this bike - to make people see me better. I used these shorter LEDs. Headlights because this touring backpack is rounded on the sides and back. It would be difficult to properly mount a long, flat LED light on such a surface. And these shorter ones worked great! I added some pictures. (-: I only have one small complaint. They are attached with 2 small Phillips head screws and nuts for each light. The nuts require a 5.5mm head. - I had 19 but I needed 20! Took me some time to find a bolt and nut (because they had different threads) that would fit exactly, so I tossed them in my drill press to spin them and ground off a smaller head with my bench grinder - and that worked! ( -: It was a bit awkward of course - But I still give these flashlights 5 stars because they are well made and come with a good gasket. They also have a pretty good review and a good price - less than $1 each - I paid $8.95 for 10 of these!
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