Waterproof 700 Lumens LED Bicycle Light 4 Modes Super Bright Bike Lamp Headlight + 8.4V Rechargeable Battery Pack + Charger for Camping, Cycling, Hiking, Riding

I needed a bright light for night rides on dark streets at 20+ mph. This one looked like a great value. I was a bit worried about the battery given the mixed reviews. This review is based on my first ride with the light. I will update after I get a few rides and charge cycles on the battery.First, I was impressed with the retail box, fit and finish of the light. looked professional and well built The battery looked good too. the battery bag seems a bit flimsy but had no issues with it on the first ride. I received the unit, and promptly charged the battery. the initial charge took almost 4 hours. Just in time for my evening group ride. I mounted the battery under the stem and hung the light under the bars just to the right of the stem. I mounted my old light on the left side as a backup. I coiled the extra wire with electrical tape then attached it to the side of the stem with more electrical tape. I know it was kind of getto, but I was in a hurry. I need to get some velcro cable ties to do it right. I also left just enough slack to allow me to leave the cable unplugged because I didn't want the battery indicator lights on the entire drive to our meet up location. Did a quick test and all 3 power levels and the blinking function worked.Started the ride on medium power because I didn't want to drain the battery too fast. It was plenty bright on the streets with street lights. On the first block I noticed that my combination cadence/speed sensor wasn't registering on my cateye stealth 50 (more on this later). I tried to reach down and tap the unit at a signal light but still nothing. Rode on with the group for 35 minutes and regrouped for a couple of minutes. I knew we were heading into unlit streets so I pressed the button once to go the high power. We rode for another 30 minutes and regrouped, this time for 10 minutes. I shut the light off to save the battery at this time. I had 2 green lights still on at this point. Turned the unit back on high and continued on for another 35 to 40 minutes. At the end of the ride there was one green light on. I got 30 minutes of medium and over an hour of high from the battery. I was curious how much was charge was left so I turned the light back on high when I got home. I left it on for another 15 minutes before I shut it off. because it was getting too late.I was really happy with the light so far. Its really bright, especially on high. I can't speak to the claimed lumin output because of I don't have another light that comes close to comparing it to. I do know that other riders have the same light and also the single bulb unit that goes for 20 dollars and the output is the same as the others. Of course its brighter then the single bulb unit.More on my computer malfunction. I read another review about interference with the sensors. I didn't remember to check it out until the next day. I checked the battery on my cadence/speed sensor and I confirmed that it was sending data to my computer. I put the light and battery back on my bike and turned it on. Everything was working normally. I have been having intermittent problems with the sending unit, so am not sure if the light is causing or making it worse. I will update when I figure out the problem and also see how the battery and battery pouch holds up over time.All in all, a great value and a great light.

This light is so bright!My last bike light was a PlanetBike 1W. I would need ten of those lights to get something with this kind of output. It's even brighter than the Knog 5.5 while still achieving a decently wide beam, though not quite as evenly distributed. Overall the beam throw, width and distribution is pretty good. It's as bright as the Niterider Lumina 650 but doesn't throw as far. It's wider than the Knog 5.5 which is wider than the Lumina, but the light isn't as evenly distributed. It's more evenly distributed than most lights in this range, though. It's not really the best in any one specific area, but it's the best overall between all areas's without spending $80-$120 for a similar light from more reputable brands.It was a risky purchase given all of the reviews across multiple brands that offer this same light and it's unusually low price tag, so I guess I am one of the lucky ones. At this price point it was worth the gamble I felt. Most people are reporting issues with the batteries rather than the light itself, so I felt that if I received a defective battery that I could just buy a new and better one to replace it and still end up spending less than what the more reputable brands offer.My only complaint is that the light does get near burning hot to the touch if there is no airflow moving across it. That was only after 45 minutes on it's highest setting. However, even a slight breeze cools it off pretty well, so I'm not concerned about it too much. At night with cooler temps with a bit of airflow just from the movement of your bike, it should be fine. If there's a slight breeze on top of that, I don't see that there would be an issue. During my battery tests when I was experiencing the heat problem, I ended up hanging it over my office fan on it's lowest setting, which is just a gentle breeze, and it's was nearly cool to the touch almost immediately afterwards.As far as battery life goes, I've been timing it on it's highest setting. So far I'm almost at three hours, which is very unusual. I'm guessing they sent the wrong battery with my model, because many people are reporting times that are nowhere near this long. I've checked the brightness setting multiple times just to make sure it's on it's highest setting and it is. Pretty odd. Not that I'm complaining! At the time of this review, the battery indicator led's just dropped down to 1 of 3 lights and is starting to blink with the light dimming a bit in correspondence. So, for the set that I received, I'm gotten about three hours worth of usage on it's highest setting. Maybe these aren't the right LED's? Regardless, it's still very and more than adequately bright so I can't complain.Pros:+ Price+ Very Bright+ 3-Hour Battery Life+ Sturdy Aluminum Body+ Easy Bike Attachment Method+ Screw-In DC Plug+ Water ResistantCons:+ Attachment Method Not As Sturdy As Other Brands+ Light And Battery Not One Single Piece+ Very Hot Without Airflow+ Quality Control