Cygolite Hypershot 350 & 250 Lumen Bicycle Taillight Models–7 Night & Daytime Modes–User Tunable Flash Speeds- Small & Durable–IP64 WaterResistant–Secure Hard Mount–USB Recharge–Great For Busy Streets

This is the brightest rear light I've seen. It isn't just the 350 lumens number to look at, the spread and patterns of the leds emit a solid deep red light that can be seen from further away and it stands out more in busy city environments. It can be seen in the day easily and can be overpowering at night but that's what I wanted. The bracket is quality and doesn't slip or move and the quick release is easy but secure.

I wanted a bike rear lamp that was powerful enough to be seen in daylight in Northern Europe as I have to traverse a few high speed road on my bike. Even in quite bright sunlight it can be seen from about 200m on max power. What I also like about it is that unlike some competitors lamps it produces a widish beam so even if the lamp is not 100 percent perfectly aligned the beam can still be seen from behind the bikes centreline. Cygolite make an even more powerful model, but I think that would be best for daylight use only in countries that have very powerful sunlight such as southern Europe. I now have four of these, one on each of my bikes.

Bright isn't the right word for this. Now nobody can claim they can't see me, even during the day. Luckily a couple of the modes allow you to turn the brightness down, otherwise I'd be causing people to have accidents when I'm cycling in the dark. It really is that bright. Brightest rear bike light I've seen. Perfect for daytime cycling

Love the strobe setting.

Excelente luz, dura muchísimo la batería y el brillo es muy intenso

The media could not be loaded.  Purchased April 2023I ride daily in NYC, and *in* traffic, since bike lanes are often overcrowded with confused riders–arguably just as dangerous as cars at times.The Hypershot 350 is actually 1 of 2 rear lights on the bike (again, I ride in traffic). It is fully visible in daylight, and unavoidable at night. I have not walked back to gauge the total distance it is visible, but I have stopped mid-street on avenues and observe the red flicker on street signs *at least* 1/4 of a mile back. If you stand 30 feet behind it, it is practically blinding. Other comments suggesting its brightness looks like an ambulance from a distance are accurate.Received multiple comments from cyclists in daylight hours "wow, that is extremely bright" and "it was so bright I had to slow down and put more distance between me and you."Excellent visibility aside, there are two ways of mounting: a vertical clip; and a lateral (side to side) release of the clip itself. The latter is completely unnecessary, and the light fell off the bike mid-ride three times before I forced the lateral mechanism shut. No issues with the charging port cover, but I see the frailty of it may become an issue; be gentle or the rubber stop will come out, and you will pain yourself to reattach it. Too many lighting options; I only use two (random strobing, pulsing flash).Highly recommended. Absolutely makes riding safer. Waterproof.Video includes use of both the Hypershot 350 (seat post mount) *and Hypershot 150.

Really bright and love all the different strobe settings. Charges pretty quickly and holds a charge well so far.

This is a great light, I've bought 2 of them (one for my wife and one for myself). They are incredibly bright and can be easily be seen on a bright sunny day. Also, I've found the battery life is great. The only downside is that if you are riding in a group you may annoy anyone behind you .... stopping the blinking and leaving it on "solid" may help. I do wish they offered more mounting options though. Our seat posts are obscured by a "trunk" so I fitted them to the bike rack over the back wheel, however the stays are too small for the supplied clips. I had to make the stays fatter by wrapping bits of an old inner tube round them.

2 reasons why this is extremely bright. A is that it has a concentrated hotspot, ie very high lux (not talking about lumens). This is the value that you get on lux meters, the amount of light that you get at a certain spot some distance away. B is that it uses an orangey red emitter, easily 5-10 nm wavelength lower than other red LEDs. So your eye perceives it as brighter (brightest is at 555nm / green colour), more efficient use of power etc.I use 2 of these 350s as the hotspot is elliptical in shape and horizontally is 10 deg spread and vertically is 5 deg spread. So 2 of these gives me a 20 degrees horizontal coverage. I also use 2pcs of Magicshine Seemee 300 for even wider coverage esp with its additional Optic-trace LED firing sideways as i mount those horizontally on the back of my saddle (on a horizontal bar facing the rear).Need to fine tune a bit the vertical angle, the jagged teeth of the vertical angle adjustment is pretty "rough" and ends up either aiming the light too upwards or too downwards, esp for 1 of my light. I end up sticking some pcs of foam tape in between the clip on the light to serve as spacers so that the angle can be further fine tune. Very good light, you will be seen during day time. Use the STEADY mode for night time use, the intensity can be fine-tuned to a pretty low level. I think the run time for STEADY mode @ 350 lumens thereabouts (yes, full intensity) is 2hrs. This is one of the rare lights that you can run at max power in steady mode and still not overheat. AND also it can accept being plugged to a power bank and the light still stays lit, thereby prolonging the runtime a lot and limited by your powerbank only.