NiteRider Sentinel 40 Tail Light

Item # NR-SNTL
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NiteRider Sentinel 40 Tail Light
Not only does the NiteRider Sentinel 40 tail light deliver an impressively bright 40 lumens of LED illumination, but this light features the ingenious Laser Lanes feature. The Sentinel 40 projects laser lines onto the ground on either side of the bicycle which creates a virtual bike lane and suggests a safe passing distance for motorists. The Sentinel 40 features both steady and flash modes and a run time of 4.5 to 36 hours (depending on mode). Re-charging the light is convenient via the USB cable -- a four-hour process for a full charge. There's also plenty of versatility in placement of the tail light with a quick release bracket for seat post mounting plus a universal clip for attachment to clothing or a bag.
  • 40 lumen output LED
  • Laser Lanes feature projects laser lines onto the ground creating rider's virtual riding lane
  • Steady modes: High and Group Ride
  • Flash modes: Flash and Pulse
  • Run time: 4.5 to 36 hours
  • Internal Li-Po rechargeable battery
  • Charge time: 4 hours (via USB cable)
  • Low battery indicator
  • Mounts to seatpost (via quick release bracket) or clothing/bags via universal clip
  • Weight: 73 grams
NiteRider Sentinel 40 Tail Light
  • RUN TIME 4.5 to 36 hours
  • UPC 702699050761
  • BRIGHTNESS 40 lumens
  • MODES High and Group Ride steady modes; Flash and Pulse modes; 3 Laser Lane modes
  • Rating 3

REVIEW SNAPSHOT®

by PowerReviews
NiteRider Sentinel 40 Tail Light
 
3.0

(based on 7 reviews)

57%

of respondents would recommend this to a friend.

Pros

No Pros

Cons

No Cons

Best Uses

  • Road biking (7)
  • Commuting/city (3)
    • Reviewer Profile:
    • Avid cyclist (5)
    • Cycling Style:
    • Speed oriented (4), Comfort oriented (3)
    • Was this a gift?:
    • No (7)

Reviewed by 7 customers

Displaying reviews 1-7

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(1 of 1 customers found this review helpful)

 
3.0

Tail light

By J B

from Lexington, MA

About Me Avid Cyclist

Verified Buyer

Pros

  • Road Laser marker
  • USB charger

Cons

    Best Uses

    • Road Biking

    Comments about NiteRider Sentinel 40 Tail Light:

    Bright rear blinky. Laser ground lights not visible during day, shows up well for dusk & dawn riding. This is a nice safety feature.
    The mounting bracket is badly designed. I have never seen a rear mounting bracket with 3 positions. Now I know why. As I am riding, bumps in the road cause the light to tilt, top-forward. The light ends up facing the rear tire. There is no "lock" for the 3 positions, so gravity wins every time. I have found a way to hold the light upright with a rubber-band. This is disappointing for a fairly expensive tail light.

    • Cycling Style:
    • Speed Oriented
    • Was this a gift?:
    • No
     
    4.0

    Great taillight!

    By Russty

    from Hampton, NH

    About Me Avid Cyclist

    See all my reviews

    Verified Buyer

    Pros

    • Controlled Brightness

    Cons

    • Needs A Recharge Every Ot

    Best Uses

    • Commuting/City
    • Road Biking

    Comments about NiteRider Sentinel 40 Tail Light:

    I needed a light that was bright-enough for when I commuted to work, yet dim-enough to not blind the guy behind me in the paceline. This has the settings for that. I even got compliments from my buddies. Not having seen anyone using this while I was in a car, I don't know how effective the laser is, but it is a big Wow factor with the buddies.
    It would be perfect if it didn't need to be recharged every other day.

    • Cycling Style:
    • Speed Oriented
    • Was this a gift?:
    • No

    (1 of 1 customers found this review helpful)

     
    4.0

    Very Bright

    By Rob P.

    from Tooele County, Utah

    About Me Avid Cyclist

    See all my reviews

    Verified Buyer

    Pros

    • Bright
    • Usb Rechargeable

    Cons

    • Mount Moves Too Easily
    • Rubber Plug Is Loose

    Best Uses

    • Commuting/City
    • Road Biking

    Comments about NiteRider Sentinel 40 Tail Light:

    I ride to work and I needed a brighter light, I have the 750 headlamp and I like that product so I picked up their tail light.
    Although it's called the 40 and I know they have brighter taillights on their website - I don't see how you could get any brighter.
    The flash modes are great. I've found as a driver that I notice odd sequences much more that a repeating flash.
    Since I usually have my light attached to an under saddle bag (Aphidura) I do not use the laser lane function, though I do see how it might help in the darkness.
    Only issues I have are that the rubber plug for the USB is loose and the adjustable seat post mount is too easy to move (shifts as I ride and I've tightened the screw) which is why it's now on the bag.

    • Cycling Style:
    • Speed Oriented
    • Was this a gift?:
    • No
     
    1.0

    Short life span

    By Lew

    from Lakewood Ranch FL

    About Me Avid Cyclist

    Pros

      Cons

      • Wears Out Quickly

      Best Uses

      • Road Biking

      Comments about NiteRider Sentinel 40 Tail Light:

      Light lasted less than six months. Battery won't take and hold a charge.

      • Cycling Style:
      • Comfort Oriented
      • Was this a gift?:
      • No

      (0 of 1 customers found this review helpful)

       
      1.0

      Risky seatpost rubber band mount

      By BURTf

      from Yardley, pa

      About Me Casual/ Recreational

      See all my reviews

      Verified Buyer

      Pros

      • This Lite Is Bright

      Cons

      • Poor Construction
      • Seat Post Mount

      Best Uses

      • Mountain Biking
      • Road Biking

      Comments about NiteRider Sentinel 40 Tail Light:

      The rubber band seat post mount is vulnerable to easy theft or accidental detach. But the lite is very bright.

      • Cycling Style:
      • Comfort Oriented
      • Was this a gift?:
      • No
       
      4.0

      Top Quality

      By Paul

      from Santa Rosa, CA

      About Me Casual/ Recreational

      Verified Buyer

      Pros

      • Durable
      • Lightweight
      • Versatile
      • Very Happy So Far

      Cons

      • No Cons

      Best Uses

      • Mountain Biking
      • Road Biking

      Comments about NiteRider Sentinel 40 Tail Light:

      The light is very bright,. I love it.

      • Cycling Style:
      • Comfort Oriented
      • Was this a gift?:
      • No
       
      4.0

      Excellent but one "watch out"

      By Canada

      from Austin texas

      About Me Avid Cyclist

      Verified Buyer

      Pros

      • Durable
      • Easy to operate
      • Excellent Brightness
      • Versatile

      Cons

      • Poor Construction

      Best Uses

      • Commuting/City
      • Road Biking

      Comments about NiteRider Sentinel 40 Tail Light:

      Excellent light but one big watch out. The junction that secures the mounting bracket and light together isn't sufficient. I Lost one light before figuring this out so now I just zip strap the two together. Other than that one challenge the light is amazing and the laser lines are a great feature.

      • Cycling Style:
      • Speed Oriented
      • Was this a gift?:
      • No

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      NiteRider Sentinel 40 Tail Light

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