Notices
General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

Night rider head light

Old 04-30-19, 05:59 PM
  #1  
Chris!
Senior Member
Thread Starter
 
Join Date: Oct 2009
Location: upstate NY
Posts: 50

Bikes: Surly CrossCheck

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Night rider head light

I got a night rider head light from REI recently. So I mowed the lawn and thought I'd enjoy an evening ride watch the sun go down and ride home. Turn my new 1000 lumin head light on and my wireless speedometer stopped working. What up with that?
Chris! is offline  
Old 04-30-19, 06:57 PM
  #2  
CycleryNorth81
Senior Member
 
Join Date: Jun 2014
Posts: 482

Bikes: custom Cyclery North (Chicago), Schwinn Circuit

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 156 Post(s)
Liked 14 Times in 11 Posts
Your light is interfering with your speedometer. Change the speedometer to a wire one or change the light.
CycleryNorth81 is offline  
Old 04-30-19, 07:09 PM
  #3  
JanMM
rebmeM roineS
 
JanMM's Avatar
 
Join Date: Jan 2006
Location: Metro Indy, IN
Posts: 15,585

Bikes: RANS V3 ti, RANS V-Rex, RANS Screamer

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 490 Post(s)
Liked 44 Times in 40 Posts
Electronics not playing well together. I've never experienced that but understand it's not uncommon these days.
REI is good on returns - wonder if they would help you located a light that won't interfere?
__________________
RANS V3 Ti, RANS V-Rex, RANS Screamer
JanMM is offline  
Old 04-30-19, 07:33 PM
  #4  
MoAlpha
• —
 
MoAlpha's Avatar
 
Join Date: Jun 2015
Location: Land of Pleasant Living
Posts: 3,143

Bikes: Occasionally

Mentioned: 38 Post(s)
Tagged: 0 Thread(s)
Quoted: 1874 Post(s)
Liked 271 Times in 155 Posts
There’s lots of talk about LED navigation lights interfering with VHF radios on boats. Didn’t happen to us.
MoAlpha is offline  
Old 04-30-19, 07:39 PM
  #5  
sweeks
Senior Member
 
sweeks's Avatar
 
Join Date: Sep 2004
Location: Chicago area
Posts: 1,191

Bikes: Airborne "Carpe Diem", Motobecane "Mirage", Trek 6000, Strida 2, Dahon "Helios XL", Dahon "Mu XL", Tern "Verge S11i"

Mentioned: 17 Post(s)
Tagged: 0 Thread(s)
Quoted: 524 Post(s)
Liked 28 Times in 23 Posts
The interference may be minimized by separating the light from the computer as far as possible (it's the old "inverse square" law). You might also try placing a piece of metal (or even aluminum foil) between the two devices. The barrier should ideally be "grounded" to metal handlebars if you have them. I'd try the separation first. :-)
sweeks is offline  
Old 04-30-19, 07:42 PM
  #6  
General Geoff
Senior Member
 
Join Date: Apr 2007
Location: Allentown, Pennsylvania
Posts: 692

Bikes: 2018 Lynskey Cooper CX; 2007 Cannondale F4

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 322 Post(s)
Liked 48 Times in 18 Posts
I had the same problem with my Niterider headlights. Moving the cyclecomputer about 5" away from the light solved the problem.
General Geoff is offline  
Old 04-30-19, 07:53 PM
  #7  
Chris!
Senior Member
Thread Starter
 
Join Date: Oct 2009
Location: upstate NY
Posts: 50

Bikes: Surly CrossCheck

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Thanks for the ideas. I'm going to try and separate them. I like the light and the speedometer. I got the 1000 lumen light on sale so I'd like to keep it. I'm not sure I'll have to check tomorrow but I wonder if my speedometer is on the same side as the sensor maybe correcting that if needed will help too.
Chris! is offline  
Old 05-01-19, 01:53 AM
  #8  
jgwilliams
Senior Member
 
jgwilliams's Avatar
 
Join Date: Aug 2004
Location: Surrey, UK
Posts: 402

Bikes: Planet X Carbon Pro Evo SRAM Force, custom built 653 and 531 bikes with frames by Barry Witcomb, Giant XTC 4 mountain bike and a Brompton folding bike.

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 118 Post(s)
Liked 7 Times in 6 Posts
I had the same with a NiteRider 750 lumen light. In fact I complained to NiteRider about it and their response was that it was because they were driving the LED so hard. I can tell you this is tosh as I now have an Exposure Strada 1200 lumen light which you can put right next to the computer without any interference whatsoever. It's down to how well the light is shielded for RF interference. I have to admit I was disappointed by NiteRider's response as I feel that otherwise they are good lights - although they battery on mine was a bit small - and for that reason I won't be buying them again.

I found that by putting enough separation between the light and the computer I was able to get them to co-exist.
jgwilliams is offline  
Old 05-05-19, 06:02 PM
  #9  
Chris!
Senior Member
Thread Starter
 
Join Date: Oct 2009
Location: upstate NY
Posts: 50

Bikes: Surly CrossCheck

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I tried just moving the light as far over on my bars as I could and it worked. I dont do much night riding so I'm happy.
Chris! is offline  
Old 05-05-19, 06:20 PM
  #10  
Gresp15C
Senior Member
 
Gresp15C's Avatar
 
Join Date: Sep 2014
Posts: 2,762
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 685 Post(s)
Liked 84 Times in 64 Posts
I do some work with electronics for my day job. Here's my guess. The light is controlling the amount of current fed to the lamps by "chopping" the power, i.e., switching it on and off very rapidly. The electromagnetic noise emitted by this process must mimic the signal from the speed sensor in a way that confuses the speedometer.

If you swing the light back and forth while looking ahead, you might notice what looks like a trail of bright dots. My light (cheap rechargeable Xanes from banggood.com) produces dots in "dim" mode but not "bright" mode, so I think the dim mode works by just chopping the lamp on and off at a 50% duty cycle.
Gresp15C is offline  
Old 05-05-19, 06:38 PM
  #11  
TimothyH
- Soli Deo Gloria -
 
Join Date: Aug 2015
Location: Northwest Georgia
Posts: 14,784

Bikes: 2018 Rodriguez Custom Fixed Gear, 2017 Niner RLT 9 RDO, 2015 Bianchi Pista, 2002 Fuji Robaix

Mentioned: 233 Post(s)
Tagged: 0 Thread(s)
Quoted: 6822 Post(s)
Liked 651 Times in 409 Posts
Originally Posted by jgwilliams View Post
I now have an Exposure Strada 1200 lumen light which you can put right next to the computer without any interference whatsoever.
+1

Exposure Strada 1200 about an inch away from a Polar GPS.

I ride >100 miles/week in the dark and have never had a bit of trouble with this setup.




-Tim-
TimothyH is offline  
Old 05-05-19, 06:58 PM
  #12  
Sy Reene
Advocatus Diaboli
 
Sy Reene's Avatar
 
Join Date: Feb 2015
Location: Wherever I am
Posts: 4,924

Bikes: Merlin Cyrene, Nashbar steel CX

Mentioned: 11 Post(s)
Tagged: 1 Thread(s)
Quoted: 2351 Post(s)
Liked 66 Times in 59 Posts
Knight Rider headlight?

Sy Reene is online now  
Old 05-06-19, 01:15 AM
  #13  
UniChris
Senior Member
 
UniChris's Avatar
 
Join Date: May 2017
Location: NYC
Posts: 846

Bikes: 36" Unicycle

Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 360 Post(s)
Liked 69 Times in 61 Posts
Originally Posted by jgwilliams View Post
In fact I complained to NiteRider about it and their response was that it was because they were driving the LED so hard. I can tell you this is tosh as I now have an Exposure Strada 1200 lumen light which you can put right next to the computer without any interference whatsoever. It's down to how well the light is shielded for RF interference.
Actually there may be some truth to their claim. If the light is pulsed, as most are, then a very fast slope to the pulse (ie, a "hard" edge) will radiate harmonic energy well into radio frequencies, the faster the edge the further up the spectrum. Mitigation would be about slowing the edge speed, not just shielding, though that might(?) reduce efficiency a tiny bit.

Which wireless sensor? Looking up its FCC I'd may indicate the radio type in use. If it's something primitive it's not hard to imagine interference.

I've thought of building a wireless computer and would probably use a digital FSK radio with some repetition in the coding.
UniChris is offline  
Old 05-06-19, 08:51 AM
  #14  
GGreenhorn
Junior Member
 
Join Date: Sep 2014
Location: Southern California
Posts: 6

Bikes: Giant Escape 3

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I had the same problem, my Night Rider light would mess up my little Cateye wireless causing it not to function. I just reoriented everything so the light is as far away from the Cateye (and the light beam is as far aware from the Cateye sender - reciever path) on my handlebars as possible. My Cateye also tends to not work so well at around 32 degress. When it was dark and cold in the mornings, mileage was just an educated guess.
GGreenhorn is offline  
Old 05-06-19, 11:01 AM
  #15  
teejaywhy
Senior Member
 
teejaywhy's Avatar
 
Join Date: Mar 2019
Location: AZ
Posts: 144

Bikes: 2019 Specialized Roubaix Expert; 2018 Breezer Thunder Expert

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 73 Post(s)
Liked 28 Times in 22 Posts
Had a weird problem with my garage door opener. Put a LED bulb in and suddenly, the remote was not working reliably. But only when I was leaving and wanting to close the door. Coming home, the door would always open just fine. Finally figured out it was related to when the light was on. Switched out the bulb and problem solved.
teejaywhy is offline  
Old 05-07-19, 06:18 PM
  #16  
dmanthree
Senior Member
 
dmanthree's Avatar
 
Join Date: Sep 2014
Location: Northeastern MA, USA
Posts: 967

Bikes: 2017 Roubaix

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 345 Post(s)
Liked 49 Times in 36 Posts
Same

Originally Posted by teejaywhy View Post
Had a weird problem with my garage door opener. Put a LED bulb in and suddenly, the remote was not working reliably. But only when I was leaving and wanting to close the door. Coming home, the door would always open just fine. Finally figured out it was related to when the light was on. Switched out the bulb and problem solved.
Chamberlain recommends only certain LED bulbs for their openers. Yes, when the light is on it can interfere with the remote opener. I had the same issue and swapped to the recommended LED bulbs and problem solved.

Clearly, the same issue can affect a bike computer. I have a Nite Rider Lumina 850 that's mounted below a Wahoo Elemnt Bolt and have zero issues. No RF with that setup, though.
dmanthree is offline  
Old 05-07-19, 07:15 PM
  #17  
AndreyT
Senior Member
 
AndreyT's Avatar
 
Join Date: Nov 2011
Location: CA
Posts: 327
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 87 Post(s)
Likes: 0
Liked 6 Times in 5 Posts
Originally Posted by Chris! View Post
I got a night rider head light from REI recently. So I mowed the lawn and thought I'd enjoy an evening ride watch the sun go down and ride home. Turn my new 1000 lumin head light on and my wireless speedometer stopped working. What up with that?
Your light is operating in PWM mode, which means that it blinks rapidly, creating radio interference.

Many lights on the market use PWM only in reduced brightness modes (this is how you reduce brightness of a LED light). When you switch them to full power, they are no longer PWM-ed and no longer interfere with other equipment.

So, were you running your light in full-power mode when you noticed the interference? If not, then try it and see what happens.

If you still see interference even in full-power mode, then you are out of luck: your light is incompatible with your wireless cycling computer. Try to keep them as far apart as possible, and if that does not help - change the light, change the computer, change something else.
AndreyT is offline  
Old 05-08-19, 02:23 AM
  #18  
jgwilliams
Senior Member
 
jgwilliams's Avatar
 
Join Date: Aug 2004
Location: Surrey, UK
Posts: 402

Bikes: Planet X Carbon Pro Evo SRAM Force, custom built 653 and 531 bikes with frames by Barry Witcomb, Giant XTC 4 mountain bike and a Brompton folding bike.

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 118 Post(s)
Liked 7 Times in 6 Posts
Originally Posted by TimothyH View Post
+1

Exposure Strada 1200 about an inch away from a Polar GPS.

I ride >100 miles/week in the dark and have never had a bit of trouble with this setup.




-Tim-
If the Polar is only using GPS then you wouldn't see any interference anyway. My Garmin was never bothered by the NiteRider. The Garmin also links to HRM and speed/cadence sensors which also continued to work fine because the signal was digital. It's only the analog link between the CatEye computer and speed sensor that was affected. Those Strada lights are really good, though, aren't they?
jgwilliams is offline  
Old 05-08-19, 09:25 AM
  #19  
DomaneS5
Fredly Fredster
 
DomaneS5's Avatar
 
Join Date: Jan 2017
Posts: 592

Bikes: Trek Domane S5, Trek 1.1c, Motobecane Omni Strada Comp, Trek X-Caliber 6

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 198 Post(s)
Liked 4 Times in 3 Posts
Get a wired Cateye bike computer like the Velo 7 or Velo 9.
DomaneS5 is offline  
Old 05-08-19, 10:02 AM
  #20  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,396

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6925 Post(s)
Liked 246 Times in 204 Posts
Put the light on your helmet, on your head ? I have an older NiteRider which doubled as a Diver's light...








...
fietsbob is offline  
Old 05-08-19, 11:05 AM
  #21  
Aubergine 
Bad example
 
Join Date: Nov 2015
Location: Seattle and Reims
Posts: 2,930
Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 772 Post(s)
Liked 17 Times in 14 Posts
I have had the same issue (and asked the same question here!). I discovered that dynamo-powered lights play nicely with computers, so I have those on my primary nighttime bikes.
__________________
Keeping Seattle’s bike shops in business since 1978
Aubergine is offline  
Old 05-08-19, 11:19 AM
  #22  
Payton1221
Senior Member
 
Join Date: Jul 2015
Location: Hill Country ;-)
Posts: 102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 59 Post(s)
Liked 1 Time in 1 Post
Not to hijack but what's the traffic like where you're riding in the dark? If anybody should be able to ride in the dark, it should be me since I live in the country with car sightings typically averaging one every five minutes, but with that noted, I've never ridden in the dark.
Payton1221 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
whitemax
Road Cycling
10
10-24-17 09:29 AM
djminnesota
Electronics, Lighting, & Gadgets
34
05-09-16 01:57 PM
mshred
Road Cycling
24
09-18-13 07:02 AM
darb85
Commuting
26
05-14-11 12:08 AM
Richard Cranium
Electronics, Lighting, & Gadgets
6
08-13-10 08:02 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.