Are bike lights becoming too bright?

It wasn’t that long ago that motorists could quite reasonably grumble about the lack of decent lighting emanating from most night-time bike riders. However, technology has moved on at a rapid pace and now you can get a decent set of powerful bike lights for less than $100 (and even more powerful if you have the cash to spare). However, with power comes responsibility, and it seems to me that many riders are forgetting that their super-bright lights can affect others.

How bright is your bike light? (c/ Anthony Rodriguez)

How bright is your bike light? (c/ Anthony Rodriguez)

It’s not so bad if you’re riding on the other side of the road. But since shifting house, my regular daily commute now takes me along more shared pathways. And now we’re in the winter months, with that I’ve seen a dramatic rise in the number of oncoming riders that seem to want to blind me and everyone else going the other way with their super-charged bike lights.

Here’s a test: At night, have someone hold your bike and switch your lights on, then stand about 10m in front of it. I suspect that for a good number of you, you may be surprised at the over-bright light shining back in your face. Just because some of it is lighting up the road surface doesn’t mean you have it pointed the right way. In fact, riding past some recent offenders, I can see quite clearly side-on that their bike light is mounted virtually horizontal. There is a simple solution – POINT IT DOWN! If it’s a particularly omni-directional light, you may even want to consider fixing some duct-tape to the top to prevent the upward light spill.

Some modern bike lights can be too bright (c/ Seattle Bike Blog)

Some modern bike lights can be too bright (c/ Seattle Bike Blog)

Another way to test: you know those typical street signs that are usually a couple of metres off the ground? If they’re reflecting or flashing as you ride by, then your lights are pointed too high.

Another annoying trend I’m noticing is the tendency for everyday riders to also wear head-mounted lighting as well as the standard handlebar-mounted ones. So even if the bike-mounted lights are pointing in the right direction, it doesn’t take much for the rider to look in your direction and WHAM! You have another face-full of lumens to contend with.

Head-mounted lights: save them for the mountain-bike track (c/ BikeRadar)

Head-mounted lights: save them for the mountain-bike track (c/ BikeRadar)

Sorry, but these things need to be confined to the mountain-bike tracks (or the winter solstice rides). Despite your best intentions, there is no way you will avoid sooner or later pointing that light in someone’s face (rider or driver) and really p**ing them off. Need more light on your ride? Put a second bike-light on your handlebars.

Bike lighting is a fine balance between being able to see other objects and being seen by others. Too much emphasis on the former and others may struggle to safely see you (and avoid you). The law is quite clear: “You must not use cycle lighting equipment in such a way that it dazzles, confuses, or distracts so as to endanger the safety of other road users.”

That bike light is probably a little bright... (c/ The Brooks Blog)

That bike light is probably a little bright… (c/ The Brooks Blog)

What do YOU think about current bike lighting practices?



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  • Jeanette
    15 July 2014, 7:33 am

    Thanks LennyBoy, a timely and accurate post. I’ve been nearly blinded by oncoming cyclists while travelling home through Hagley Park at night. Thanks for the tip about checking our own lights as I’d also been wondering if one of my own front lights might not be optimal in this regard.

  • CP
    15 July 2014, 10:15 am

    I completely agree with responsible use. Another factor to consider is it’s really hard for other road users to judge distance from very bright horizontal lights. 100m & 10m look quite similar so riders doing that may not be actually improving their own safety at all, or could even be making it worse.
    I’m using high power LED (600-900 lumen from on handle bars pointed so that it’s centred on road 2-3m in front of bike. Lent it against fence, walked away & it’s good from front. Not great some side though & disappears quite quickly unless you look at the road rather than the bike.
    Do disagree to some extent with comment about never using helmet lights on road. Many of the ‘attacks’ come from side on & I’m sure my helmet light has saved me a few times. I’ve got it pointed to similar spot on road as handlebar light in normal riding position, but it is possible to lift head & shine it at approaching hazards. I do need to be aware of it as at traffic lights while standing it’s easy to have to pointing nearer horizontal.

  • Criggie
    15 July 2014, 10:18 am

    I have a head-light torch, and its quite bright. However during normal riding its aimed at the ground, about three metres in front of me. If I want to point it somewhere, I have to raise my head to do so.

    I also have a UV torch that is aimed from my handlebars back at my cycling vest… it makes that yellow flouro light up really well at night.

    Plus a normal flinking front and a pair of back ones too.

    For the next winter solstice I’m thinking about something involving EL wire…

    • CP@Criggie
      15 July 2014, 10:34 am

      UV torch ? Keen to know more.
      I’d considered small light on bike pointing towards reflective hi viz but waste of time as the light reflects back towards the light source, not all directions.

    • CP@Criggie
      16 July 2014, 11:31 am

      Is UV more effective than other types of light source ?

      • Criggie@CP
        16 July 2014, 12:06 pm

        For lighting up flouro – definitely! Those yellow/green/orange flourescent colours use dyes that reflect UV light but at a lower wavelength, essentially converting UV light into visible light.
        Makes the object appear brighter than it really is.
        This effect slowly wears off with age and sunlight.

  • cbpitstop
    15 July 2014, 3:57 pm

    During the colder months I use a 500 lumen light only because I cycle through a dark wooded road with no street lights around. I still angle it downwards a bit though. I feel it is too bright to use on flashing/strobe while in the city, so I leave it on constant. I know a few fellow cyclists who buy less powerful lights so they can use them for flashing.

  • Ben DW
    16 July 2014, 9:44 am

    Agree with pretty much everything everyone has said, and have wanted to have a rant about high-powered flashing lights on shared pathways myself for a while. The question I’ve got is, how do we actually solve the problem? Your blog has raised the issue with a certain amount of people, but I don’t think it’s going to solve the problem overnight. This issue seems to have flared up due to the recent availability of cheap, high-powered lights, and as with many other developments in technology, etiquitte around their use may take time to develop. How can good use of lights be promoted effictively among the wider cycling population?

    Meanwhile, best just to do what the road code says when being blinded by approaching vehicles’ headlights: look to the left hand side of the road (/path) – and chill out (more a note to self).

    • CP@Ben DW
      16 July 2014, 10:21 am

      Educating appropriate use will be difficult as very few people read instructions ! Still it’s far better a rider has a high power light used wrongly than a dim light or no light at all.

    • Criggie@Ben DW
      16 July 2014, 12:03 pm

      The thing about a bike is that the rider is not hidden behind a layer of glass and soundproofing. Just yell out “cheesus that’s bright!” or cover your eyes and yell out “ARGH! IT BURNS!!!”



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