55 votes

Legality and morality around wearing a red / blue flashing light on a bicycle in the UK?

Don't show a red light of any kind on the front unless you want a head-on crash. Red is for the back only, steady or flashing. In the shadows it will look like you're riding the wrong way down the ...
Chris H's user avatar
  • 58.9k
54 votes

Should unconventional colors be avoided for lighting?

A quick search, however, shows other colors available to purchase. Concerning "to be seen" bicycle lights, should they be avoided? Yes, they should be avoided. First, off-colors might not be legal ...
Andrew Henle's user avatar
  • 10.6k
45 votes
Accepted

Should unconventional colors be avoided for lighting?

Most places will legally require you to run with white lights on the front and red lights behind. This is crucially important because it immediately tells everybody else on the road whether you're ...
David Richerby's user avatar
44 votes

Legality and morality around wearing a red / blue flashing light on a bicycle in the UK?

Legality aside, this is a bad idea. The entire point of putting distinctly colored lights on emergency vehicles is to make them instantly recognizable as such, letting people know that they need to ...
jimchristie's user avatar
  • 11.8k
43 votes

Polite way to ride in the dark

There are now many bike lights on the market which have a shaped beam with a "horizontal cutoff" giving strong light onto the road or path, but much less above the horizon. When adjusted ...
James Bradbury's user avatar
39 votes
Accepted

Polite way to ride in the dark

Consider how you feel when a fellow cyclist approaches you will full beam straight ahead. It's pretty blinding, even for a moment, and especially off-road when your eyes aren't used to it. So in a ...
PeteC's user avatar
  • 514
38 votes
Accepted

Can I legally use front facing blue light in the UK?

Regulation 16 of the Road Vehicles Lighting Regulations (1989) states: Restrictions on fitting blue warning beacons, special warning lamps and similar devices No vehicle, other than an ...
David Richerby's user avatar
34 votes
Accepted

Are Penny-Farthings Legal to Ride on Public Roads (UK)

UNITED KINGDOM Intro I ride a 50" Penny-Farthing almost daily on the UK's public roads, both individually and as part of groups in daylight and evening conditions. Before venturing out onto the ...
F1Linux's user avatar
  • 2,203
33 votes
Accepted

Is there a benefit to turning off dynamo-powered lights?

Yes, there is an efficiency gain by turning the lights off. Cyclingabout made a hub dynamo comparison based on an experiment by skjegg, where power consumption was measured for different dynamos ...
calofr's user avatar
  • 1,059
26 votes

Should unconventional colors be avoided for lighting?

The topic has been discussed here in the Netherlands, and found an answer summarized in the below chart (text translated into English from the original): Wrapping up: lights should be fitting the ...
L.Dutch's user avatar
  • 7,121
19 votes
Accepted

Dynamo hub lights flickering: should I be concerned?

Shimano hubs and B&M lights should work nicely together. I've used that combination in the past. You need to ride around for a few minutes to charge up the capacitors that power the stand-lights ...
Paul H's user avatar
  • 4,102
18 votes

Where can I put my rear light that is designed for the seatpost if the saddle bag is in the way?

You could attach the light to something else, like another part of the frame, or a tab on the saddle bag, or your backpack. You could remove the saddle bag, attaching onto e.g. the handlebars or ...
Swifty's user avatar
  • 12.8k
15 votes
Accepted

Mounting light on handlebar with bag installed

As Chris H notes, the clerk was wrong. And he suggests a good suggestion to raise the light above the bag. However, you can also mount the light below the bag as well. Operating on the same principle ...
RoboKaren's user avatar
  • 29.2k
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
  • 50.5k
14 votes

Legality and morality around wearing a red / blue flashing light on a bicycle in the UK?

Restrictions on fitting blue warning beacons, special warning lamps and similar devices 16. No vehicle, other than an emergency vehicle, shall be fitted with (a) a blue warning beacon or special ...
Noise's user avatar
  • 13.9k
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
  • 124k
13 votes
Accepted

DIY system for charging battery packs from hub dynamo

Decathlon uses a third party part, that is available for sale if you want to fit it on your bike: Cycle2Charge The category name for this kind of products is "headset cap USB charger" or &...
Rеnаud's user avatar
  • 20.2k
12 votes
Accepted

Why doesn't my (battery-powered) light work in the cold?

There are two reasons why it might not work: The batteries don't like the cold. Many battery chemistries don't like the cold -- notably alkaline, manganese (heavy-duty), and NiMH/NiCad batteries. To ...
RoboKaren's user avatar
  • 29.2k
12 votes

Is there a bicycle light which is hard to steal or very portable?

I always carry lights with me when riding. If I'm parking somewhere safe, like my garage at home or our locked bike room at work, then I'll leave lights attached. If I'm at the shops then I lock the ...
Criggie's user avatar
  • 124k
11 votes

Does anyone make a dynamo light buffer battery that will keep it going at full power?

There are standlights, which are essentially supercapacitors combined with LED headlights. They're designed to be charged from the dynamo while riding and give you a few minutes of extra lighting when ...
RoboKaren's user avatar
  • 29.2k
11 votes

Why doesn't my (battery-powered) light work in the cold?

Batteries, especially most types of rechargeables don't work well in cold conditions. The chemical reaction that powers the electric voltage does needs some temperature to perform as intended. If you ...
Benedikt Bauer's user avatar
11 votes

Rear light with failure warning

The problem is that you have to start considering the failure modes of the failure detection system. You're quite likely to end up with a less robust system or a lot of false alarms if you have a ...
Chris H's user avatar
  • 58.9k
11 votes

Where can I put my rear light that is designed for the seatpost if the saddle bag is in the way?

You obviously have very little seatpost exposed. Most cyclists on compact (i.e. sloping top tube) bikes should not be in this situation, but some of us are on level top tube bikes and some of us have ...
Weiwen Ng's user avatar
  • 31.5k
11 votes

Is there a benefit to turning off dynamo-powered lights?

In general I leave mine on all day (SP-PD8 and Axa luxx 70) but it does take a little extra pedalling effort. A few Watts is likely to be a couple of percent of your effort, but if you were into ...
Chris H's user avatar
  • 58.9k
10 votes

Polite way to ride in the dark

I had to face exactly this on an old commute. Dipping the front light was absolutely necessary in a park and another stretch of unlit bike path. It was a bright enough light to illuminate the road, ...
Chris H's user avatar
  • 58.9k
10 votes

Should unconventional colors be avoided for lighting?

Depending on where you are in the world, there may be legal requirements. For example here in New Zealand at night time you MUST have White light on the front, no more than two, only one may flash, ...
Criggie's user avatar
  • 124k
10 votes

Are dynamo hubs specific to particular lights?

Speaking in terms of past few decades to current generator hubs and lights, mostly they are interchangeable, with some qualifiers and exceptions. Almost all current hubs and lights are based around 6 ...
Nathan Knutson's user avatar
10 votes
Accepted

Where is the Shimano e-tube project light connection setting?

Shimano hides this kind of information behind its TEC site. This is for 'industry professionals', but you can register by selecting some random bike shop as your place of work, there are no checks. ...
thelawnet's user avatar
  • 4,230
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
  • 124k
10 votes

150 VS 300 VS 450 lumen rear light for daytime use

Which lights are you considering? Even 150 lumens seems astoundingly powerful. For comparison, the Bontrager Flare R City (which I use) is already somewhat irritating to look at after a while, and it'...
MaplePanda's user avatar
  • 15.5k

Only top scored, non community-wiki answers of a minimum length are eligible