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68 votes

Red light facing forwards?

No. You should always ride with a white light facing forward and a red light facing backwards. If you want additional illumination, you can add multiple white/red lights in the appropriate direction. ...
nhinkle's user avatar
  • 3,893
22 votes

How can I attach Harbor Freight blue puck lights to mountain bike for front lights?

Do not do this! You mention in the comments that you’re almost entirely riding on the road. The pictured light is (based on having used them for other purposes myself) essentially useless for ...
Austin Hemmelgarn's user avatar
20 votes

Fortified Bicycle appears to gone out of business -- where to get one of their replacement bike light batteries?

If your light is not sealed, and you can see a battery that looks like this (the colour/color does not matter) then you can pop out all the old batteries and fit new ones. Replace all the batteries ...
Criggie's user avatar
  • 128k
19 votes

General mounting solutions for lights etc

I use a couple of hose clamps, and two rubber strips or offcuts from old inner tube. I have also used double-sided foam tape and electrical tape, but the inner tube ones are the best. This setup is ...
Jahaziel's user avatar
  • 12.6k
16 votes

Do rotational-symmetric-looking front lights usually throw half their light into oncoming traffic? How To dinstiguish?

Unfortunately, there are a lot of head lights for bikes out there which do not have a sharp cutoff at the top of the light cone to avoid blinding oncoming traffic. You have to check each individual ...
cmaster - reinstate monica's user avatar
15 votes

Fortified Bicycle appears to gone out of business -- where to get one of their replacement bike light batteries?

First, hello, and welcome to Bicycles SE. Sorry to hear about your manufacturer collapsing... that's really unfortunate, particularly for a higher-cost item like an e-bike. My guess is that 18350950 ...
Andrew's user avatar
  • 978
15 votes

How strong should lights be for a route partially in a city and partially outside city on a public road?

https://bikelightdatabase.com/ has a lot of good information. There is much more to a light than output. Optics is far more important (and in parts of the world, its illegal to use bike lights that do ...
mattnz's user avatar
  • 51.7k
13 votes

Is my helmet/camera/light setup dangerous?

If we check the helmet's documentation, there's guaranteed to be some legalese text in there similar to: modifications to the helmet will void warranty, and may decrease the effectiveness of the ...
Criggie's user avatar
  • 128k
11 votes

Where to mount a headlight if the handlebar is obscured by a basket

Something like this accessory is what you need: Can be fitted onto wired or meshed bicycle baskets. This specific model is made by the "Rixen & Kaul" and can be found in many online shops. E.g. ...
John Assymptoth's user avatar
10 votes
Accepted

What is the process of adding a light to a Yamaha PW equipped ebike?

Okay, so I did some research into this and here's what I found: The Yamaha drive offers enough power for many, but not all, ebike lights to be connected. For example, Supernova M99 Pro won't work -- ...
Dmitri Nesteruk's user avatar
10 votes

Mounting the front light on the frame instead of the fork or the handlebar?

The light is better on your handlebars or fork than on your frame - the frame lags and always points at some tangent to where you're going while turning, so either you need a really wide beam, or you ...
Criggie's user avatar
  • 128k
9 votes

Conceptual: Bike Lights built into Grips

You would be entering in a very busy market with no obvious advantages. Let's look at the two types of LEDs that you might use: If you're using inexpensive and low-power 5050 LEDs (15 lumens@350mW; ...
RoboKaren's user avatar
  • 29.3k
9 votes

Is my helmet/camera/light setup dangerous?

Safety is not an absolute. The transition from Safe to Unsafe does not happen immediately. The state of the helmet is probably considered not safe, compromised, but not unsafe. Much will depend on ...
mattnz's user avatar
  • 51.7k
9 votes
Accepted

Why are there no/very-few bicycle-specific lights with replaceable 18650 Li-Ion batteries?

Technical reasons: It’s harder and more expensive to design and manufacture a sturdy, lightweight, waterproof case which can be opened by the user. It’s also harder to design and manufacture spring ...
Michael's user avatar
  • 28.4k
9 votes

How strong should lights be for a route partially in a city and partially outside city on a public road?

For illuminating the road ahead at speed where you'll get motor assistance on a UK-legal e-bike, 300 lumens in a well-shaped beam is plenty. You only need the sort of output you mention for off-road, ...
Chris H's user avatar
  • 60.8k
9 votes

How can I attach Harbor Freight blue puck lights to mountain bike for front lights?

Realistically, this tool is for lighting up your worksite and is unsuitable for use as vehicle illumination on the road. Why? The focused spotlight on the end is a tight beam, and is too narrow to ...
Criggie's user avatar
  • 128k
8 votes
Accepted

What is the difference between Light and Motion's Urban 800 Chainbreaker and Urban 800 Anchor Steam bike lights?

Just the color. The products are identical. Light & Motion lists their different color variations as separate "products", probably due to some limitation of their store site engine. Note that ...
nhinkle's user avatar
  • 3,893
8 votes

LASER bicycle lights

The most important part of a vehicle light is the optics because you want a beam with a precise shape and distribution in order to illuminate the road evenly, without wasting light into the sky or ...
bobflux's user avatar
  • 1,784
7 votes
Accepted

Light brightness indication

You can't directly convert because you need the distance and beam angle. Lumen is a measure of output while lux is how much light is falling on an object. 5 lux is very dim indeed, less than a sliver ...
RoboKaren's user avatar
  • 29.3k
7 votes

What is the process of adding a light to a Yamaha PW equipped ebike?

OK, just added Lezyne E50 and Hecto rear fender lights to a Giant Lafree E+2. That is these lights: Like others have said, remove two motor mount bolts and let it pivot on the third bolt: Then pull ...
Rod Badcock's user avatar
7 votes

Is this a bike light and how do I turn it on? (I know it sounds stupid)

This is a halogen light. Such lights are usually powered by a bottle dynamo. That is a small electric generator that is driven by the front or the rear wheel. There is usually no switch. One simply ...
gschenk's user avatar
  • 9,808
7 votes

Can I get a bright rear light using AA batteries, or is there a compelling reason why nonreplaceable batteries are so widespread?

Most modern lights use rechargeable lithium ion batteries. Those come in three form factors: Pouch cells, cylindrical cells and coin cells. Pouch cells come in a lot of different dimensions which ...
Michael's user avatar
  • 28.4k
7 votes

Is my helmet/camera/light setup dangerous?

No, this is not safe. The light very likely will blind/dazzle or at least annoy oncoming traffic or pedestrians. I do not know how strong yours is, but if I shine mine directly into the face of an ...
AnoE's user avatar
  • 847
7 votes

General mounting solutions for lights etc

I use FreeCAD to produce STL files that then can be sent to the number of 3D printing services possible to find on a web, including some that aggregate multiple 3D printing providers. The benefit of ...
nightrider's user avatar
  • 7,899
7 votes

General mounting solutions for lights etc

This second answer of mine is more a "hack" for emergency cases. This was an experiment, I tested it and think it was successful, but I do not suggest you make this on purpose for constant ...
Jahaziel's user avatar
  • 12.6k
6 votes
Accepted

How to tell if this light's bulb is blown? And what kind of light is it?

It's an LED. Easiest way to see if it is damaged is to connect it to a battery and see if it lights up. The difficulty is that you can't disassemble the the white plastic unit, so if the LED does ...
Argenti Apparatus's user avatar
6 votes

KNOG BLINDER ARC 5.5 battery replacement

A quick google search turns up this forum entry by user “RNAV”: https://www.bikeforums.net/electronics-lighting-gadgets/1085170-knog-arc-5-5-battery-replacement.html Remove the trim that surrounds ...
Michael's user avatar
  • 28.4k
6 votes

Can I get a bright rear light using AA batteries, or is there a compelling reason why nonreplaceable batteries are so widespread?

You mention riding from dusk to dawn. That's a rare situation. Most buyers of lights do fairly short rides, at least the after dark bit of the ride, and may want daytime flashing. Being able to charge ...
Chris H's user avatar
  • 60.8k
6 votes
Accepted

Accessory mount extender for curved bar: stem bolts vs double clamp

Most batery lights can be tilted a few degrees. The mount of your Spanninga light looks exactly as if it may be tilted as well. Check by removing the light, and look for a screw inside the bracket. If ...
gschenk's user avatar
  • 9,808
6 votes

Flying Pigeon brake pads - change or not

Welp, you have 'stirrup' style brakes that pull radially against the rim and will have limited power compared to brakes that apply opposing forces to either side of the rim. There is a reason this ...
Argenti Apparatus's user avatar

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