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  1. #1
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    15lumens to lit up a road way in front of you, is it enough?

    I have search many front commuting lights, it is about 30-100lumens will give you good enough front visibility.
    the other reach 300-1200lumens for speed cycling.

    have someone tried a lezyne KTV drive front lights?
    It has 15lumens on constant mode, will it be enough to lit up the way?

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    RR3
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    No, it won't light up the road.

    The purpose of this light is to be seen by others.

    I find that I need 200 lumens broadly spread to properly see on dark country roads. With rain or if there is a lot of light pollution, 300 lumens or 450 is what I select on my lights.

  3. #3
    Seņior Member ItsJustMe's Avatar
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    Good grief, 15 lumens isn't even enough to look for a real flashlight in my bag.

    If I was absolutely forced to, I'd maybe ride with 100 lumens up front, but I'd have to reduce speed. I consider 200 to be bare minimum, 400 to be comfortable.

    You can get 400 lumens for < $25 these days, including rechargeable battery and charger.
    Work: the 8 hours that separates bike rides.

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    RR3
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    I should have noted that I have really good vision and for my age, the pupils open well so I can see very well at night although not was well as my teenager who can see non-illuminated objects in the distance at night that I cannot see. Age is a big factor in how much light you need. 15 lumens is kind of a joke.

  5. #5
    . tedder's Avatar
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    I use the Nite Rider Lightning Bug 3. It's small and only 50-60 lumens, but it's enough for those training rides that are just barely past sunset.

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    Quote Originally Posted by mingjae View Post
    I have search many front commuting lights, it is about 30-100lumens will give you good enough front visibility.
    the other reach 300-1200lumens for speed cycling.

    have someone tried a lezyne KTV drive front lights?
    It has 15lumens on constant mode, will it be enough to lit up the way?

    No. 15 lumens is like one of those bathroom night lights you plug in your outlet.

  7. #7
    Senior Member no motor?'s Avatar
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    Try riding with enough light and you'll see why 15 lumens isn't enough.

  8. #8
    Senior Member Seattle Forrest's Avatar
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    No.
    Don't believe everything you think.

  9. #9
    Senior Member dwmckee's Avatar
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    15 lumens is plenty... if you are a raccoon...
    Last edited by dwmckee; 05-01-15 at 07:20 PM.

  10. #10
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    NO! 15 lumens might not make it from the bars to the ground and back.

  11. #11
    Bluebird of Hapiness Marcus_Ti's Avatar
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    Quote Originally Posted by davidad View Post
    NO! 15 lumens might not make it from the bars to the ground and back.
    Well....if you were on a pitch black country road with no street lights, no cars, no house lights, no moon, no bike computer....and you'd had your eyes adapt to that dark for 30 minutes, had a good reflector/lense...then you might be safe to go 5MPH.

  12. #12
    Senior Member RoadTire's Avatar
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    80 lumens (stated) and I can see a small gray dog almost 50 ft away. Just enough time to blink before you are a** over teakettle
    FB4K - This December, 2014, 5288 kids received bikes for Christmas. For many, it was their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. That amounts to well over 10,000 volunteer hours this fall, just in the Twin Cities. Check us out on FaceBook: FB4K.
    Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.

  13. #13
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    Hi all! you we're right, 15lumens is kind of kitchen cabinetry night lights.. lol
    maybe it is suitable for "be seen" lights only which the road condition has good enough road lighting facilities.
    me tested a 140lumens flashlight in a morning sunlight and I almost can't detect even the flashlight is on or off.

    Quote Originally Posted by tedder View Post
    I use the Nite Rider Lightning Bug 3. It's small and only 50-60 lumens, but it's enough for those training rides that are just barely past sunset.
    ok thank you, so 50lms will be good enough for cycling home?
    I was in a store testing that lezyne 15lm, its bright enough if you see it directly to your eyes, I was think it will also give you a good chance to lit up a road but me only take the rear light one, me only like the design, it is tiny and standing in front of the stem bars.
    any recommendation for the same design lights for about $15-20 but brighter?

  14. #14
    Dog is my co-pilot 2manybikes's Avatar
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    Quote Originally Posted by mingjae View Post
    Hi all! you we're right, 15lumens is kind of kitchen cabinetry night lights.. lol
    maybe it is suitable for "be seen" lights only which the road condition has good enough road lighting facilities.
    me tested a 140lumens flashlight in a morning sunlight and I almost can't detect even the flashlight is on or off.



    ok thank you, so 50lms will be good enough for cycling home?
    I was in a store testing that lezyne 15lm, its bright enough if you see it directly to your eyes, I was think it will also give you a good chance to lit up a road but me only take the rear light one, me only like the design, it is tiny and standing in front of the stem bars.
    any recommendation for the same design lights for about $15-20 but brighter?
    Shining a light into your eyes does not indicate that it is good enough to see by. I have one light that is 260 lumens, it is OK if you are careful and go slow, and there is no other ambient light like cars coming the other way. One problem is that when you are exposed to a bright car light going by in the other direction your eyes adjust to the bright light, but then it passes and goes away. You need a bright light to help then. On a pitch black location your eyes have time to readjust and you can get by with less, as long as no other light is around. Even a street light will be a problem as you pass away from the light it makes into darkness. With traffic passing in the other direction, 260 lumens is marginal in the short time when your eyes adjust to the darkness. You need to see the surface of the ground to avoid holes, objects etc.

    When selecting a light, one needs to know the run time it provides at the lumen setting you need. This depends on your ride time in the dark. I always like a lot more run time than I need in case I get a flat or something.
    I finish long rides on the dark about once a week. And one short ride home once a week. I do 4 hours in the dark very frequently. I want at least five hours run time for that. I have been lost in the middle of nowhere too.
    That's when I like my 5:45 run time. I also carry a back up light for more time, and in case my main light breaks. My short rides home are only about 40 minutes. 1.5 hours run time is fine on the small light I use for this. The small light gives me 1.5 hours 600 lumens for the traffic, and about 4 hours at 300 lumens for the dark unlighted bike path. That's fine for me, I do have to see potholes, cats, rabbits etc. The 600 lumens allows me to see a rabbit way over at one side, before it runs into my path on the bike path. The 300 lumens is about the minimum for this. But it works.
    Last edited by 2manybikes; 05-06-15 at 09:18 AM.
    [SIGPIC][/SIGPIC]

  15. #15
    Senior Member no motor?'s Avatar
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    Quote Originally Posted by mingjae View Post
    Hi all! you we're right, 15lumens is kind of kitchen cabinetry night lights.. lol
    maybe it is suitable for "be seen" lights only which the road condition has good enough road lighting facilities.
    me tested a 140lumens flashlight in a morning sunlight and I almost can't detect even the flashlight is on or off.



    ok thank you, so 50lms will be good enough for cycling home?
    I was in a store testing that lezyne 15lm, its bright enough if you see it directly to your eyes, I was think it will also give you a good chance to lit up a road but me only take the rear light one, me only like the design, it is tiny and standing in front of the stem bars.
    any recommendation for the same design lights for about $15-20 but brighter?
    Shining a light in your eyes in the store is a bad way to judge the effectiveness of a light - and if you can stand to look at it in the store it's going to do you much good when riding.

  16. #16
    coprolite fietsbob's Avatar
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    The lower the light is to the road surface the brighter it will appear.

    I first got the B&M Lyt BN that Brompton was Using , its 15 'Lux' ( lumens or lux you figure out the conversion difference , if it Matters)

    http://www.bumm.de/produkte/dynamo-s...motec-lyt.html

    It had a 2nd input to be fast to fit at the factory ..

    Mine was from a dealer, not from the factory.. Narrow spot was Bright enough at 19" off the pavement
    but lacked standlight, so I returned it and Got an Eyc-T instead
    all models have standlight and the beam spread is wider..
    http://www.bumm.de/produkte/dynamo-s...c-iq2-eyc.html
    Last edited by fietsbob; 05-14-15 at 03:39 PM.

  17. #17
    Dirt Bomb sknhgy's Avatar
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    It's enough for your wife's bike if you are trying to collect insurance.
    more cops have been killed by donuts than guns in chicago it is a medical fact ask any doctor.

  18. #18
    Dog is my co-pilot 2manybikes's Avatar
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    Quote Originally Posted by sknhgy View Post
    It's enough for your wife's bike if you are trying to collect insurance.
    [SIGPIC][/SIGPIC]

  19. #19
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    Quote Originally Posted by sknhgy View Post
    It's enough for your wife's bike if you are trying to collect insurance.
    That's cold!

  20. #20
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    Quote Originally Posted by sknhgy View Post
    It's enough for your wife's bike if you are trying to collect insurance.
    A light (pardon the pun) just went on in my head.

    I thought the hand-rubbing, hunched shoulders, shifty eyes and gleeful smirk while I was installing my wife's 15-lumen gift on my bike didn't match that of a happy wife who's simply glad her husband is enjoying his present. Color me disappointed.

  21. #21
    Senior Member hotbike's Avatar
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    Passing Bike.jpgI've got about 900 lumens on the front of my bike, and two red lights plus an outline of the reflective triangle on the rear...
    http://www.flickr.com/photos/11629987@N02/sets/72157639939606343/

  22. #22
    Senior Member hotbike's Avatar
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    LED Bicycle Headlights by AviationMetalSmith, on Flickr
    900 lumens, not counting those blue-white strips, or the amber marker lights. All twelve volt, Light Emitting Diodes (LED).
    LED Bicycle Headlights by AviationMetalSmith, on Flickr
    and bringing up the rear^
    http://www.flickr.com/photos/11629987@N02/sets/72157639939606343/

  23. #23
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    I see you have already realized 15 lumens isn't gonna work. I used to have a 40 lumen light when I started cycling. I thought it was good because most people would see me at dusk. When I had to get home after the blue hour a few times, I got kinda irritated that it was me who couldn't see what I had in front of me (especially on unlit parts of the road or on some park alleys I was using to get home faster). That's when I decided to look for something more stable and finally got myself a proper 1000 lumen light. I've rarely used the max setting since it's so damn bright, but it's been a game changer. I feel completely comfortable riding at night in all kinds of terrain, and I also feel the higher setting helps during the daytime with motorists paying more attention to me at junctions. I just don't use the strobe setting because I'm afraid people might get a seizure.

    In the meantime, I see a new model of my own light has come up and it's even stronger. I'm definitely recommending this!

  24. #24
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    have been LED for years,don't suggest using 15lumen, this is not enough for cycling at night, 1000lm will be better,this item can be USB rechargeable,no need worry battery run out

  25. #25
    aka Tom Reingold noglider's Avatar
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    That thing is a weapon, literally!
    I have made this longer than usual because I have not had time to make it shorter. --Blaise Pascal

    Tom Reingold, noglider@pobox.com
    Residences: West Village, New York City and High Falls, NY
    Blogs: The Experienced Cyclist; noglider's ride blog

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