19 votes
Accepted

Turn signal lights for bikes

I'd recommend learning to do arm signals. Arm signals don't run out of batteries, and are plenty visible in most cases. They're certainly bigger than the turn signal lights you could put on a ...
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  • 45.4k
12 votes
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Bike lights with beam cut-off to avoid dazzling drivers?

I have actually dramatically improved the cutoff on my 1200 lumen dual LED (just for reference) with a sort of brim made out of aluminium plate. On road I run it on minimum brightness (guessing about ...
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  • 44.9k
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 ...
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11 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 ...
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  • 28.4k
11 votes
Accepted

Flashing light when pushing bike with (constant) low speed

This happens because the power from a hub dynamo (which technically is a magneto, not a true dynamo) is not clean sine-wave AC but consists of short pulses with alternating polarity. At high speeds ...
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  • 19.1k
10 votes
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Which front and rear lights can run while charging?

USB rechargeable lights are not typically designed to be run off of USB power continuously, they're only designed to be charged over USB. I run The Bike Light Database, and have tested dozens of ...
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  • 3,763
9 votes

Bike lights with beam cut-off to avoid dazzling drivers?

In Germany, all bicycle lights above a certain lumen value have to have a low beam feature, so it's pretty standard here. So, if you do not want to kludge your existing headlight get a german one, e....
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  • 1,199
9 votes
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Using an LED torch as a helmet light, will I blind oncoming drivers?

I have a helmet mount very similar, and yes its totally possible to dazzle and annoy any other road user, from pedestrians to other cyclists to motorised vehicle drivers. Benefits to a helmet light ...
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  • 96k
8 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; ...
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  • 28.4k
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 ...
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  • 1,249
8 votes

Has anyone successfully changed the battery in a Knog Blinder Mini Dot?

I found this which suggests that you'll have to open it by force - I'd try a razor saw if there's no obvious edge to pry. You may not need to replace the battery - if there's a protection circuit ...
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  • 369
7 votes
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How to check your dynamo system?

When checking a Dynamo system, there are 3 basic items which need confirmation: Power Supply: Is your dynamo producing power? Checking this requires a multimeter, preferably with alligator clips on ...
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  • 29.2k
6 votes

Bike lights with beam cut-off to avoid dazzling drivers?

Lights that are road-legal in Germany have this cut off. The Trelock LS 950 is a good example.
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  • 522
5 votes

Stopping interference between LED lights and wireless cycling computer

I too had major interference problems between my 700lumen Smartlight (no, not the Garmin one, just a brand called Smart) and VDO M6 wireless computer with all 3 sensors (speed, cadence, HRM) stopping ...
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  • 167
5 votes

Stopping interference between LED lights and wireless cycling computer

The problem is the current controller built into the LED bulb has no or ineffective EMC suppression. This is extremely common in cheap equipment from unbrand named suppliers, who save costs by not ...
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  • 39.3k
5 votes

Hub dynamos and standlights

Thought I should update this just in case anyone's been looking (probably not so much in summer!). I got a good deal on a B&M Cyo plus. This has a switch and standlight. The rear light connection ...
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5 votes

Lights that don’t use o-rings

To give a brand neutral answer: all the big light brands have at least some o-ring mounting styles now, but some of them still offer clip-in brackets as optional parts for the same lights. And there ...
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4 votes

Are revolights a good idea?

As a Revo Lights owner I like them a lot as a second light source. Since the light is lower to the ground they do a better job of lighting up the pavement immediately in front of you. For being seen, ...
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  • 41
4 votes
Accepted

Hub dynamos and standlights

If your rear light will not come with standlight function, so (in the options I know) the front light with standlight will not "turn it on" at the rear light. Such lamp is AXA Echo 30 Auto Steady. It ...
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  • 2,623
4 votes

Using an LED torch as a helmet light, will I blind oncoming drivers?

Not necessarily blind, but annoy and distract. For oncoming traffic, the best lights are ones mounted below eye level and that limit the upper beam. The easiest way to check for this online is to see ...
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  • 19.1k
4 votes

How reliable is the "smart" brake detection on a $20 tail light?

The brake detection is based on an accelerometer, and is not a complicated feature. I have had a similar feature on a Chinese front light and it worked ok from what I can see. So that's probably not ...
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  • 4,040
3 votes

LED headlight eating away at power output of USB charger

A hub dynamo is typically rated at 6V/500mA, and most lights will use all of that. Modern LEDs give you a lot more light from that power, but it's still nowhere near as much as the high powered ...
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  • 23k
3 votes

My Serfas USL-5 raider usb headlight failed after rain, should I attempt user service?

Don't attempt user service. The rubber front-piece doesn't give access to the body, the case body is tightly shut, and there is no way in through the power button. All you'll do is ruin the pre-...
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3 votes

How much light is enough for year round commuting?

Going fast on unlit roads you definitely want a decent light. Personally I find the combination of my 100 lumen dyno headlight plus another 100 lumens on the handlebars to be enough, but I ride ...
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  • 23k
3 votes
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How are hub dynamo lights wired and why does a rear light cause the front to come on?

Shimano hub generators have an electrically connected axle (stupid but fact, it comes from the time when bicycle lights were connected unreliably using a single cable closing the circuit using the ...
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3 votes
Accepted

How much light is enough for year round commuting?

I suspect you will find 800 lumen to be plenty, even for avoiding debris on unlit roads. For context, I commute in the dark (and often in the rain) along unlit back roads and along our regional trail ...
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  • 29.8k
3 votes

Turn signal lights for bikes

Learn to look back while riding straight. That is much more important than making any signal. Also the movement of the head is usually a good indication to the driver behind of what your intentions ...
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3 votes

Turn signal lights for bikes

Suggested compromise: Hand signals, but wear reflective material on your arms to make those signals more visible.
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  • 271
3 votes

How helpful are neon/led lights on the rims, while riding at night?

The motion of the light is what does the work, the colour is less important as long as its bright. A valve light will describe a "flattened corkscrew" through the air and is obviously different to ...
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  • 96k
3 votes

Installing Schwinn Vestige frame LED cable

I would start by pulling the seatpost, fork and the bottom bracket. Use a small mirror similar to a Dentists type to try to see if the wire is attached in the frame or just passes thru. You may then ...
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  • 18k

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