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What front light has the best battery longevity?

Old 05-27-24, 10:52 AM
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What front light has the best battery longevity?

Looking to do a 24 hour ride this fall. I have found a great rear light with the Bike Spark BKS-G4R. Will get me through several night rides if asked to do so. Looking for something similar for the front. I do ride with a battery pack to extend range on Garmin, phone, etc. Could use a front light with power connection that comes in from the bottom so rain doesn’t become a factor.

Not interested in any dynamo options that require a wheel rebuild. What is everyone else using from a rechargeable standpoint?
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Old 05-27-24, 06:21 PM
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A common choice in the UK Audax world is the Lumintop B01 (I can't post a link yet, but I'm sure you can find one via Google). They're a really great little light that checks a lot of boxes:
  • StVZO style shaped beam
  • Good brightness - adequate for unlit roads at "medium" setting
  • Excellent battery life. Medium brightness provides 10-11hrs of continuous operation on one charge
  • Takes 21700 Li-ion rechargeable batteries, with a charging port integrated into the light (and on the underside)
  • As the batteries are standard, you can easily have a spare or two stored in a handlebar bag for longer
  • Dirt cheap - £25 ($30) shipped to the UK. Batteries not included, but another £10-15 per battery will get you good ones

They have a pretty decent handlebar mount included. I chopped that up a bit and now have mine mounted at the fork crown. It's done perfectly for several all-night rides so far.
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Old 05-28-24, 02:00 AM
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I usually run a dynamo but now and then do longer rides with battery packs.

Gloworm (G1) plus big battery pack.

https://www.glowormlites.co.nz/produ...-plus-g1-0-rf/
https://kaidomain.com/bike-lights-and...n-Battery-Pack

For a rear I like the Cygolite hotrods, one on each seat stay.
https://cygolite.com/product/hotrod-90-usb/
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Old 06-01-24, 09:53 AM
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I also like the lumintop B01. For the price of a dynamo hub, one could buy a couple and still come out ahead financially. I also like the colour of the light, it's a bit yellow.
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Old 06-02-24, 08:37 PM
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Thank you all, I will check them all out.
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Old 06-03-24, 02:55 PM
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What front light has the best battery longevity?

ANSWER - THE FRONT LIGHT YOU DON'T TURN ON...........

I couldn't help it - the post triggered the full "Richard Cranium" response...... However, there is a point to discussing what and how a cyclist can use differing battery and light combinations the most efficiently.
A starting point would be to consider how much light he/she needs in differing conditions - and then compute the necessary battery supplies to provide it.
This means that a cyclist that can control the output of his light according to specific road/trail conditions lengthens effective battery run times. Charging down an unknown hill at 30mph + may require a cyclist to use 1500 lumens of brightness to feel comfortable. Conversely, riding back up the next hill at 10mph may require only 500.

Any cyclist attempting to assure ample lighting for "all night long" riding needs to pay attention to how much variability to expect in lighting needs due to the route. Typically, differing light manufacturers give different weight to particular facets of a bike light. Some have much better reflectors than others. Some actually have better or worse voltage regulation and heat dissipation than others.

Bottom line - there are so many excellent lighting/battery choices, and so many personal preferences - that this is another only marginally answerable post. FWIW - I almost always used multiple lights, so I never gave much attention to "trying for one great light."
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Old 06-05-24, 09:31 PM
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I guess you can study a subject so long that all the info starts to be overwhelming. As Richard said, maybe you run with multiple options. I have run with different styles of Cygolites that are rechargeable from the rear. I have a 20,000 mah battery that supplements my electronics on the handle bar (phone, lights and Garmin 820). Having different style cord connectors needs to manages as well.

Some of the newer lights that were suggested here, have the newer USB-C style connector and frankly, thought of stringna fourth type of cable up my tiller post was not at the top of my list of things to do. As a result, I selected a Trek Ion Pro RT (purchased from REI). It has the same type of connector (mini USB) as the Garmin 820. It has the connection port underneath the body, which will aid in preventing rain intrusion.

One thing I failed to confirm before I purchased the $140 light, will it charge while in operation. If anyone has that answer, I would appreciate the info. Since I purchased this from REI, I have a 30 day trial period.
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Old 06-07-24, 11:43 PM
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Originally Posted by tdk27
A common choice in the UK Audax world is the Lumintop B01 (I can't post a link yet, but I'm sure you can find one via Google). They're a really great little light that checks a lot of boxes:
  • StVZO style shaped beam
  • Good brightness - adequate for unlit roads at "medium" setting
  • Excellent battery life. Medium brightness provides 10-11hrs of continuous operation on one charge
  • Takes 21700 Li-ion rechargeable batteries, with a charging port integrated into the light (and on the underside)
  • As the batteries are standard, you can easily have a spare or two stored in a handlebar bag for longer
  • Dirt cheap - £25 ($30) shipped to the UK. Batteries not included, but another £10-15 per battery will get you good ones

They have a pretty decent handlebar mount included. I chopped that up a bit and now have mine mounted at the fork crown. It's done perfectly for several all-night rides so far.
will they charge while on?
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Old 06-07-24, 11:54 PM
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https://lightandmotion.com/products/rando-500

although it comes with a weird proprietary USB cable you are obligated to use to charge it.
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Old 06-08-24, 03:36 AM
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Originally Posted by PromptCritical
will they charge while on?
Good question - I don't know, and the documentation is pretty thin.

Unless you're in the depths of winter, you can easily get an entire night's riding from a single charged cell though, so "charge in the day, ride through the night" should work if you have a dynamo and it turns out not to support pass-through charging.
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Old 06-08-24, 10:23 AM
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Originally Posted by Polaris OBark
https://lightandmotion.com/products/rando-500

although it comes with a weird proprietary USB cable you are obligated to use to charge it.

This one charges while on ^^^ and is rated to last 24 hours in day time flash mode (on its own charge).
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Old 06-08-24, 08:33 PM
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Originally Posted by Polaris OBark
This one charges while on ^^^ and is rated to last 24 hours in day time flash mode (on its own charge).
It only runs at 1/4 power while charging though.

FAQ

Can the Rando charge while in use?

Yes, the output is reduced to 125 lumens in low or pulse mode in order to allow the light to charge.
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Old 06-09-24, 01:55 PM
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Originally Posted by Polaris OBark
This one charges while on ^^^ and is rated to last 24 hours in day time flash mode (on its own charge).
This is exactly the kind of thing I looked at when picking the Lumintop and rejected.

1. Poor beam shape: round spot, not a proper shaped headlight beam.
2. Insufficient battery life: 3hrs at 500 lumens, so maybe 6hrs at 250. This means that it can't handle an overnight ride except in high summer.
3. Integrated battery: No ability to swap out battery to get the light back online quickly, requires a full stop to recharge - or I guess trickle charging off a battery pack and hope the dim light is enough.

All for more than twice the price.
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