Magicshine has recently released a number of new Seemee taillights that combine smart features with impressive output. In this review, we’ll be looking specifically at the Magicshine Seemee 100 one of the more affordable variations that has dual element LED design. The Seemee 100 is quite affordable at only $34.99 for the features, and also boasts a maximum of 100 lumens of output. With this latest generation of tail lights, Magicshine has incorporated both an ambient light sensor as well as a brake sensor. These two sensors allow the taillight to automatically adjust the output based on the current conditions as well activate a boosted output mode during deceleration to attract attention. 

The Magicshine Seemee 100 is an affordable tail light that offers smart integrated sensors and enough brightness for both daytime or nighttime riding.

CategoryBicycle Tail Light
Rating 8.5/10
Retail Price$34.99
Measured Weight (in g) 36 (taillight): 12 (seatpost mount) + 4 (saddle mount)
Likes+ Battery status checker
+ Ambient light sensor and brake sensor
+ Excellent side and daytime visibility
Dislikes– Integrated battery
– Only slightly cheaper than Seemee 180
– Confusing number of output modes
Where to Buy (US)Magicshine
15% OFF coupon code: “TheSweetCyclists”


The Seemee 100 comes in a simple box with the characteristic black and orange graphics. Another nice feature is the large opening in the center of the packaging that allows you to interact with the tail light.

In the box you’ll find:

  • Seemee 100 tail light
  • Seatpost mount
  • Saddle mount
  • 2x Zip ties
  • Micro USB charging cable
  • User manual
  • Warranty card


The Seemee 100 comes with two mounts out of the box: a seat post mount and a saddle rail mount. While the seatpost mount has the same design as most mounts, a plastic mount with flexible rubber strap, Magicshine has added a clever design detail. The portion of the seat post that sits against the seat post has a rounded profile for standard seat tubes as well as a second rounded cutout. This second cutout allows the seatpost mount to also work on aero seat posts that have sharper trailing edges which would cause typical seat posts mounts to not sit flush. With a simple second cutout, Magicshine has created an easy to use seatpost mount that should work with nearly any seatpost.

Magicshine Seemee 100 - mount
A saddle rail mount and round_aero seatpost mount is included in the box

In addition to the seat post mount, a simple plastic seat rail mount is included right out of the box. It is a single sided piece of plastic that has two rounded hooks that snap onto your saddle rails (note elliptical saddle rails will not work). On our saddles, the saddle rail mount had a satisfying click when installed and felt secure. We prefer the higher mounting of the tail light as it has a cleaner look on the bike and better visibility. However, if you are using a saddlebag or high-mounted fender you may not be able to utilize this mount. We do wish Magicshine had included a body clip though, since it is convenient to mount a tail light to a saddle bag or backpack.

Magicshine Seemee 100 - saddle mount
Included saddle mount is easy to use and install


The Magicshine Seemee 180 has a tall rectangular profile with a lens design that utilizes transparent optical fibers. There is a two part illumination pattern, a vertical center line and a rectangular outer ring that surrounds it. You’ll find the Magicshine logo ghosted onto the left and right sides of the housing. With the light off, the lens is not visible from side angles, which initially had us worried about side visibility. However, part of the housing surrounding the lens of the Seemee 100 is transparent and becomes illuminated when the light is on allowing for 260° visibility.

Magicshine Seemee 100 - side visibility
Excellent side visibility due to transparent front portion of tail light

On the back of the tail light, there is a simple quarter turn style mount (a feature shared with the other Seemee tail lights), and a micro USB port under a rubber cover. The light is rated for IPX6 which means wet weather riding should not be a problem. Although we wish the battery was replaceable (like the Lupine Rotlicht), the integrated battery provides great runtime and allows for a better sealed tail light.

Magicshine Seemee 100 - power button
The power button illuminates with a three level battery status

The user interface on the Seemee 100 is well designed, as it utilizes a single click to change the setting within a mode or a double click to switch between output types (steady – flash – smart). A long press turns the light on or off in any mode with the built-in mode memory ensuring the tail light is always restored back to the last selected mode. Magicshine has also incorporated a battery status checker into the one-button interface (quite similar to the Fenix BC05R and BC21R v2 lights) that allows you to short press on the power button to illuminate the backlight for 3 seconds to indicate the battery status. It is a three-level indicator that turns either a green (21-100%), steady red (6-20) or flashing red (>5%). This is a feature we’re excited to see, as it lets you check the battery before you start riding.


The Magicshine Seemee 100 has an integrated motion sensor that can automatically detect braking to activate the boosted 100 lumen mode. Regardless of the current output mode selected, the light will switch to steady 100 lumen for a few seconds to attract attention. This is a feature that’s becoming increasingly popular and can provide extra safety on the road. How effective is it? That isn’t clear, especially as there is no standardized implementation but the light output change should draw attention. One downside with the brake sensor feature though is that runtime becomes reduced depending on how often the mode is triggered.

The calibration of the brake sensor is an additional aspect that determines how useful the feature is. With the Seemee 100, we found that it was overly sensitive and would trigger even on bumps. This is consistent with the Magicshine Seemee 60 which also had a sensitive brake sensor and would often trigger when riding. We prefer the calibration of the Fabric Lumasense V2, which was less sensitive but still not foolproof. Although Magicshine doesn’t provide multiple sensitivity options like the Lupine Rotlicht, you can toggle the brake sensor on/off by simply holding the power button while the light is off for a few seconds. Additionally, the Seemee 100 will revert to a standby off mode if no motion is detected after 1 minute to conserve battery.


Not only did Magicshine  integrate a brake sensor into the Seemee 100, they also added an ambient light sensor. Unlike the Seemee 200 which also uses the sensor to determine if the downward facing LED should be activated, with the Seemee 100 the sensor is only used for the smart output mode. If the sensor detects higher ambient light, the smart mode has a slower on-off flash output (better suited for daytime riding). In low-light situations, the output mode switches to a low power – high power flash setting to improve nighttime visibility. We preferred to ride with the smart mode as it allows the Seemee 100 to automatically choose the best mode for the conditions. This provides a similar experience as the Light and Motion Vya Pro or Bontrager Flare RT and is one of our favorite features.

COMPARISON (Seemee 100 vs. other Seemee tail lights)

If you’ve read this far into the review, you may be wondering how the Magicshine Seemee 100 compares to the other Seemee tail lights. Across all the current Seemee tail lights (200/180/100/30) you’ll find the same light output modes, user interface, battery status checker and ambient light sensor. The Seemee 100 is actually quite similar to the Seemee 180, but has lower output and a different lens design. We think the Seemee 180 is the better buy at only $5 more, as it has an extra 80 lumen output and more eye catching optics. Note, the Seemee 200 has a higher retail price of $44.99 but offers a unique downward facing LED that illuminates a ring around your bike for excellent visibility. For those on a tighter budget though, the Seemee 100 offers a lot of features for a low price point.


More is better. At least that’s the strategy Magicshine uses when they develop the output modes for their lights. Across the Seemee tail lights (200/180/100/30), Magicshine has programmed three constant modes, four flash modes and the slick ‘smart’ mode for a total of 8 settings. A single click cycles through the different levels and a double click to alternate between the main steady – flash – smart setting groups. Unlike the Seemee 200 which uses the ambient light sensor to control the secondary tracer LED, the Seemee 100 only utilizes the ambient light sensor for the smart output mode.

The three steady modes are: low (18 lm), medium (36 lm) and high (72 lm) with runtimes that vary from 1.5 hrs to 3.5 hrs. Instead of only having the typical on/off flash, Magicshine has added four different flash patterns: breathe (ramps up from 0 lm to 72 lm and back to 0 lm), comet (ramps down from 72-0 lm), flash (standard on/off at 72 lm) and finally interactive (alternatively flashes the inner and outer rings at 72 lm). The runtimes for flash modes vary from 2.5 to 6 hours, and we particularly like the breath and interactive modes for their uniqueness. The last mode is called ‘smart’ and as we discussed in the previous section utilizes the ambient light sensor to switch between 70 lumen flash or a 3-70 lm night mode flash. 

Although the flash modes are distinct from each other, the smart mode is quite similar to the flash and interactive mode which makes it easy to get lost while cycling through the different modes. We would prefer if Magicshine simplified the number of output modes to ‘smart’ and perhaps a steady or flash mode though, something Light and Motion Vya Pro has done. In real-world riding, there is little use to having so many modes, particularly when a light sensor can be programmed to automatically optimize the output for the conditions. Also, if you plan to do multi-hour rides, you’ll need to remember to use the flash, interactive or smart mode to ensure you have enough battery runtime.


Overall, we found that the Magicshine Seemee 100 is a smart tail light with high lumen output for an attractive price. The integrated brake and motion sensors provide automatic features that are useful in real world riding while the partially transparent housing ensures you have 260° visibility. Even though we wish the brake sensor calibration was better tuned, Magicshine has provided an easy interface to disable the brake sensor if desired. We are also very happy to see the three level battery status indicator that lets you easily check the battery status instead of only relying on a low battery warning. In our opinion, the biggest flaw of the Seemee 100 is that it is overshadowed by the brighter Seemee 180 as it only costs an additional $5. Nevertheless, compared to other tail lights on the market the Magicshine Seemee 100 offers features not typically available at an attractive price point.

Disclaimer: The product for this review was provided by Magicshine. The views expressed on this website are solely those of the authors and are here to help people make an informed choice before a purchase. The authors or the blog itself does not get any monetary compensation from the product manufacturer or third-party websites/vendor links that are posted here.

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