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Headlight with a cutoff beam pattern

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Headlight with a cutoff beam pattern

Old 07-18-17, 07:06 PM
  #1  
srestrepo
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Headlight with a cutoff beam pattern

i've looked at a bunch of lights on peter whites page and subsequently on the busch & Muller page and i really like the idea of a bright, focused beam of light.

presently i'm using a Cygolite Metro 1100 headlamp which is plenty bright. admittedly though, i find my self pointing it lower and lower to not offend oncoming drivers or pedestrians. on many occasions, i've seen people put their hands up to block the light from my bike and once was asked by a police officer to dim or lower the beam after he thanked me for trying to be safe.

i'm looking for any of the busch & muller type beams where the it is focused using a mirror or some sort so that most of the light is directed at the road but i dont have a dynamo hub and dont like the idea of a NiMh battery pack that wont hold up in the cold. this will be my first full year trying to commute year round in new england weather and worrying that my headlamp isn't going to turn on or run short due to the cold isn't an option.

does anyone have any suggestions for any lights of this type?
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Old 07-18-17, 07:23 PM
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The main thing most cyclists could do to help is aim their lights downward toward the road rather than straight ahead into the eyes of oncoming cyclists, pedestrians and vehicle traffic.

In our local casual group rides participants are often reminded to do this, and most folks cooperate. But most cyclists I encounter on the MUP aim their lights directly ahead at eye level. Doesn't matter if they're casual cyclists on comfort hybrids or roadies, they all do it.

The Busch & Muller Ixon IQ lamps are AA powered (alkaline or rechargeables), with the same beam design and accessory hoods are available to minimize overspill.

The Serfas True series, including my SL-255, have a small lens hood that somewhat limits overspill. But the main characteristic limiting overspill is that these are all designed as spot lights, rather than floods. They have a stronger central beam with less bright periphery.

For that reason I prefer the Serfas for riding the local MUP to minimize blinding oncoming cyclists and pedestrians. The peripheral beam isn't strong but it's good enough with dark adapted eyes to see the path edges.

My Light & Motion Urban 500 also has a strong central spot but also a more balanced peripheral beam that's more balanced and makes it easier to see the periphery. The drawback is that it blinds oncoming folks unless I aim it downward.

I've experimented with homemade light shades and it looks like the most cost effective candidate will be made from an older black plastic film canister cut with utility scissors and attached with Velcro or some other retaining method.

A sheet of any opaque black material would work as well, possibly available from a hardware or crafts supply store.

Ideally I'd like the hood to be re-positionable, because I switch between mounting the light on the handlebar in normal orientation, and on the headtube which mounts the light sideways.
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Old 07-18-17, 07:56 PM
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My light has a very wide beam. I leave it as-is for lighting around sunset, but add the shade if I'll be riding when it's dark.

A long hood is necessary

A hood or shade needs to be quite long to actually start to cut off the beam. I held up stiff cardboard along the top of the light and experimented. For a sharp cutoff, my light would need a hood twice as long, and much wider. This doesn't remove off all the light above the cutoff line, but it's much less bright for oncoming viewers. It does cut off completely at eye level if I temporarily tilt the light to aim just 10 or 15 feet in front of me.

It's also nice on group rides, so the riders with mirrors can still see behind. And the light bouncing off the underside of the shade spreads a diffuse lighting to each side of my front wheel, also very nice for the following riders to see the road ahead. The front of the bike is illuminated, too.

The plastic is cut from one of those frozen entree trays from the supermarket. Very stiff and sturdy. A small tab of duct tape holds it in place, then the "rubber band" cut from an old inner tube makes it secure.
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Old 07-18-17, 08:48 PM
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I don't know about your Metro, but I have a Cygolite Expilion, and it has a fresnel lens that does a reasonably good job of focusing the light on the road. I normally use dyno lights, and one time I turned on the expilion expecting it to light up something above me, but it didn't. I think the fresnel lens start a little bit higher than the low end of their line 750 maybe?
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Old 07-18-17, 09:09 PM
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I was driving home just a little bit ago and there was a bike coming towards us, but across a wide street, that was by far the brightest, most annoying light I've ever seen. I have the B&M Cyo Premium and think it is a great light. But if you aren't going dynamo that's out. Point your light down so it forms and oval, how far down is up to you, but the top of the oval should hit the street.
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Old 07-19-17, 09:51 AM
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I have the B&M Ixon Core which has the German-mandated focused beam. It does an excellent job. Mine has the rubber band mount, and there is a clamp mount available with a real bolt. I recommend the latter clamp. It might be an add-on. I saw it for sale on a European web site. I bought my light from a European web site, too. It is rated at 50 Lux on high and 15 Lux on low.

Battery life is excellent. Construction quality is excellent.

User interface is excellent. Hold the button for two seconds to turn on or off. Press it briefly to change the power level. Every few seconds, the power button flashes. If the light is on low, it flashes red. If it's on high, it flashes blue. The number of times indicates the charge: five flashes means fully charged, and one flash means nearly discharged.
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Old 07-19-17, 02:47 PM
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Ravemen CR series sounds like what you're looking for. It has an anti glare cut off so as not to blind oncoming pedestrians/cyclists/motorists.

It comes in a 300 and 500 lumen version.

They also have a higher powered PR series that uses the same lens.

https://www.ravemenbikelights.com/co...led-bike-light
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Old 07-19-17, 08:18 PM
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I was looking at lights at the bike shop today, and I noticed the Hotshot tail light has a frenel lens. There is a reasonably sharp cutoff. The Metro 650 had a Fresnel lens, that's the only one they had in stock. I don't know if they will sell just the lens if you have one without.
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Old 07-19-17, 08:24 PM
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Originally Posted by unterhausen View Post
I was looking at lights at the bike shop today, and I noticed the Hotshot tail light has a frenel lens. There is a reasonably sharp cutoff. The Metro 650 had a Fresnel lens, that's the only one they had in stock. I don't know if they will sell just the lens if you have one without.
The Cygolite Hotshot 150 tail light has what looks like a Fresnel lens, with the grooves. But it's actually a wider beam than the older Hotshot 2W. I aim it down slightly, to bounce some red light off the road surface, but it's still bright at eye level. It does have a continuous mode that can be dimmed way down if there's other riders with you.
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Old 07-19-17, 08:48 PM
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yes, Fresnel lens spreads the beam wider, but limits the height. It works pretty well on the height. Some people might like to have the beam more concentrated, but I think it's fine, particularly for a tail light. The beam is a rectangle with rounded corners.
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Old 07-19-17, 09:01 PM
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I point my light low to spare others, except in conditions where I really need to see. Shining a bright light at the pavement right in front of me wrecks my night vision, meaning I can only see what the light is on. Next light will have a focused beam. Sadly (for others) my 10 year old Serfas is still as good as new.

Ben
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Old 07-20-17, 06:28 AM
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Originally Posted by srestrepo View Post

does anyone have any suggestions for any lights of this type?
The B&M headlights comply with the German standard known as StVZO. If you want to get a light with a similar beam pattern, look for some marking that it meets the StVZO standard.

Peter White does a great job of showing the difference between bike headlights. The only other place that I know of that provides beam measurement and comparison is We Test Lights | Independent Tests, Reviews and Technical Comparison of LED Lights


Steve in Peoria
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Old 07-20-17, 11:21 AM
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Originally Posted by EricSteven5 View Post
Ravemen CR series sounds like what you're looking for. It has an anti glare cut off so as not to blind oncoming pedestrians/cyclists/motorists.

It comes in a 300 and 500 lumen version.

They also have a higher powered PR series that uses the same lens.

https://www.ravemenbikelights.com/co...led-bike-light
+1 on the Raveman's. I have the CR500 and have been very happy with it. Not sure it's 500 lumen but it gets the job done, puts a nice wide spread of light directly on the road and has a very noticeable cut-off. The only downsides are that the battery is only good for about 90 min. on high and the flash modes are in the main UI. I could wish for a larger ( and or switchable ) battery and flash modes that are hidden. It does have a removable wired remote and that is a big plus.

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Old 07-21-17, 02:47 PM
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One nice thing about a circular beam pattern is that you can mount the headlight upside-down, under the handlebars. This can be helpful on crowded bars, and also seems to be a bit more stable. Specialized makes a shaped-beam light that mounts out front and under the stem, which is kind of cool. And of course many of the German lights are designed for more permanent fork crown or rack mounting, which also solves the problem.
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Old 07-21-17, 02:59 PM
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Originally Posted by zacster View Post
I was driving home just a little bit ago and there was a bike coming towards us, but across a wide street, that was by far the brightest, most annoying light I've ever seen. I have the B&M Cyo Premium and think it is a great light. But if you aren't going dynamo that's out. Point your light down so it forms and oval, how far down is up to you, but the top of the oval should hit the street.
I tend to ride with my headlight on dim most of the time, but will bump it up to high for fast descents. With the rubber band mount, it is generally easy to point it downward when approaching pedestrians and traffic (it also shows pedestrians that I've seen them).

Unfortunately, not all cars dim their lights, and there are some that blast a person with off-road lamps.

The Specialized Flux Expert would be nice, but not in the budget at the moment.
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Old 07-22-17, 03:56 PM
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Busch & Muller Ixon Premium on Ebay. You will likely get a type c euro plug adapter but the charger can handle 120 so a simple adapter works. I was lazy and just use my old NiMH wall charger. It isn't every day I need the light so this works best for me.
I also have a cheap Amazon "shark" 300 lumen light that I use on my Trail bike rides. The price was right and it serves as a nice flashlight. The beam doesn't have a cut-off by lens design but it does have a hood that helps keep the light more oval. I prefer some height off-road so I can see the brush that's about to hit me. On the road, I prefer not to blind the on-coming traffice so the Ixon is a no-brainer. You won't regret it. There are reviews on YouTube that are very well done.
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Old 08-01-17, 07:42 AM
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I'm starting to see lights with cutoff beam patterns coming from cheap Chinese sources. I'm seeing a few on Banggood for instance. Worth a look.
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Old 08-03-17, 03:28 PM
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B&M make a Battery light too, Ixon IQ,Premium. 4AA replaceable batteries, available with a recharge in place plug in it,
and that charger included..
I have the earlier version, and am OK with using a separate battery charger .

batteries that get cold, lose efficiency, it is just how it is..

mountaineering head lights solve that by running a long cord to the battery pack that you keep warm inside your coat.




....

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Old 08-03-17, 11:19 PM
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I'm working on yet another homebrewed shade for my Light & Motion Urban 500 to act as a cutoff at the top. This one looks promising. It's cut from a white translucent nylon pill bottle, easy to shape with scissors and a craft knife. It's shaped to snap onto the recess behind the front of the L&M barrel, and should rotate for mounting the light sideways on the headtube as well as the handlebar. No need for the Velcro or tape I had to use with my previous experiments.

I'll need to use some black tape or something similar to shield the top of the bottle-shade. The sides glow bright white, which may enhance side visibility. I should have some test photos and video soon.
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Old 08-07-17, 05:14 AM
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i just found the lupine SL A 7. claimed a 900 lumens with a completely cut off beam pattern.

i'm going to try and see if a friend of mine who has experience with a 3d printer can make me a shroud for my current Cygolite Metro 1100 but i'm definitely thinking about upgrade tot hat Lupine light - the beam shots look are a thing of beauty.
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Old 08-08-17, 09:26 AM
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Originally Posted by srestrepo View Post
i just found the lupine SL A 7. claimed a 900 lumens with a completely cut off beam pattern.
I googled that and saw a German web site selling it for 385€! That's another league from most lights.
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Old 08-09-17, 06:15 AM
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B&M IQ-X E is 150 lux and ~7W. 100 Euro. Not sure what's involved in driving an E-Bike light off regular batteries though...

https://www.rosebikes.com/article/b-...ht/aid:2679159
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Old 08-15-17, 02:57 AM
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since you are in england, check ravemen lights too. I remember there is a review on road.cc and the lights got some nice scores. And their lights is mainly selled for cut-off beam, self-contained with li-ion battery, almost what you are looking for in the thread.
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Old 08-15-17, 06:11 AM
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Originally Posted by znomit View Post
B&M IQ-X E is 150 lux and ~7W. 100 Euro. Not sure what's involved in driving an E-Bike light off regular batteries though...

https://www.rosebikes.com/article/b-...ht/aid:2679159
That looks pretty serious. It requires DC, so you can't use a dynamo. I like the fact that it accepts anywhere from 6 to 60V input. You could wire two 18650 cells in series. Or I guess you could use a battery pack made for a Magicshine type light which I believe uses four such cells.
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Old 08-16-17, 07:55 PM
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Originally Posted by znomit View Post
B&M IQ-X E is 150 lux and ~7W. 100 Euro. Not sure what's involved in driving an E-Bike light off regular batteries though...

https://www.rosebikes.com/article/b-...ht/aid:2679159
Whoa that looks fantastic. Very interested. Could hope for a US importer.
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