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New B&M 100lux headlight.



 
 
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  #81  
Old December 11th 17, 01:12 AM posted to rec.bicycles.tech
John B.[_3_]
external usenet poster
 
Posts: 3,967
Default New B&M 100lux headlight.

On Sun, 10 Dec 2017 12:07:54 -0600, Tim McNamara
wrote:

On Sun, 10 Dec 2017 10:58:56 +0700, John B wrote:
On Sat, 09 Dec 2017 19:58:49 -0600, Tim McNamara
wrote:

The piece that you and Steven don't seem to get is that "good enough"
is good enough. Better than "good enough" rapidly becomes multiple
redundancy and enters diminishing returns. I don't need a beam
suitable for going 100 miles an hour because I never will go that fast
on my bike. But I descended on unfamiliar roads with my old halogen
setup at 25 mph; I could descend faster with my current LED light and
expect that will be even more true with the incoming eDelux II.

When is enough enough? When one succeeds in recreating daylight?
Fiat Lux!


Damn, probably 50 years ago I rode back and forth to work with a
bottle generator and a headlight with an incandescent light bulb. And,
part of the ride was across small "dikes"perhaps 10 - 12 inches wide
that divided a rice paddy. Slipping off the path there ended up with
the cyclist being knee deep in very smelly sludge.

Amazingly I rode that bike nearly every day for a year or so and never
had a problem.


I'd have probably ended up in the rice paddy in broad daylight. ;-)


Back in those days the Japanese used human feces for fertilizer and
rice paddies had a rather "rich" odor. My guess was after you fell in
once you'd have gotten off and pushed from then on :-)
--
Cheers,

John B.

Ads
  #82  
Old December 11th 17, 02:19 AM posted to rec.bicycles.tech
James[_8_]
external usenet poster
 
Posts: 5,733
Default New B&M 100lux headlight.

On 08/12/17 19:52, Oculus Lights wrote:
On Tuesday, December 5, 2017 at 9:35:43 PM UTC-8, James wrote:
On 04/12/17 11:28, Oculus Lights wrote:
On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote:
https://www.bike24.com/p2144878.html



Is there a power rating?


One can safely assume it will work with any normal 6V/3W dynamo.

100 lux at 10 meters, as the STVZO test requires, is exceedingly
bright. I'm hesitant to state they "must" be drawing at least
so much power, but my gut feeling is that its in a range that a
single LED can't handle.


Depends on how the light is focused.

Anyone can rate a light without stating the distance. My single
LED 325 lumen measures 33 lux at 10, 500+ lumen measures 50 lux,
and the best of the others on the market, such as Supernova's 205
lm that's standard equipment on many e-bikes, measure 25 lux at
10 meters, at most.


My B&M IQTec Premium is rated at 80lux. It also works with a 6V/3W
dynamo.

The light is focused to a very bright band just before the cut off,
so that you can aim the light well in to the distance and achieve
a relatively even illumination of the road surface over the entire
distance.

If yours is only reaching 33 lux, it is less well focused and more
of a flood light.

See images here.
http://www.bentrideronline.com/messa...d.php?t=131473



Those "if" statements followed by unsure speculation from
conventional wisdom are always fascinating.


There was nothing unsure or speculative about my reply.

--
JS
  #83  
Old December 11th 17, 02:31 AM posted to rec.bicycles.tech
James[_8_]
external usenet poster
 
Posts: 5,733
Default New B&M 100lux headlight.

On 10/12/17 10:40, Oculus Lights wrote:
On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote:
https://www.bike24.com/p2144878.html


My ray traces shown
on the Learn More page on the Oculus website have literally no center
spot, virtually no red dots at all, ...


https://www.barrybeams.com/learn-more.html

On the Learn More page I see a screen shot of a "computer simulation".
I assume that is of the light projected horizontally against a vertical
surface. Given that, it will not illuminate the road surface evenly at all.

I also see a picture of a supposed NASA Rover with an Oculus flood
light, that shows a bright spot just in front of the vehicle.

Is that what I was supposed to see?

--
JS
  #84  
Old December 11th 17, 03:34 AM posted to rec.bicycles.tech
Jeff Liebermann
external usenet poster
 
Posts: 2,801
Default New B&M 100lux headlight.

On Mon, 11 Dec 2017 13:31:17 +1100, James
wrote:

On 10/12/17 10:40, Oculus Lights wrote:
On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote:
https://www.bike24.com/p2144878.html


My ray traces shown
on the Learn More page on the Oculus website have literally no center
spot, virtually no red dots at all, ...


https://www.barrybeams.com/learn-more.html

On the Learn More page I see a screen shot of a "computer simulation".
I assume that is of the light projected horizontally against a vertical
surface. Given that, it will not illuminate the road surface evenly at all.

I also see a picture of a supposed NASA Rover with an Oculus flood
light, that shows a bright spot just in front of the vehicle.

Is that what I was supposed to see?


I think the rover photo is intended to show how the Oculus Light
improves illumination at a distance. I don't see that on the photo. I
find it very difficult to judge intensity from an image consisting of
different white levels. To be sure, I converted the image to false
color:
http://www.11junk.com/jeffl/pics/bicycles/Front-Light-False-Color/
Original image:
http://www.11junk.com/jeffl/pics/bicycles/Front-Light-False-Color/slides/occulus-rover.html
False color using the "16 colors" LUT (look up table):
http://www.11junk.com/jeffl/pics/bicycles/Front-Light-False-Color/slides/occulus-rover-false-color.html
Note that the false colorizing assumes that the ground is uniform and
of equal reflectivity across the viewing area. I'll spare you my
opinion of the beam pattern because I'm not certain that my criteria
is the same as NASA's.

You can make your own false color images using a Java program called
ImageJ. Instructions lifted from my previous posting at:
https://groups.google.com/d/msg/rec.bicycles.tech/wPP-6f7mJOE/75h2lv1aAwAJ
https://imagej.nih.gov/ij/
Load original image.
Convert to gray scale with:
Image - Color - Channels Tool
Set it for Grayscale, which should also set it for only Channel 1.
The image should now appear in gray scale.
Convert the image to false color with:
Image - Lookup Tables
Pick an LUT (look up table). I suggest 16 colors or BRGBCMYW.


--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
  #85  
Old December 11th 17, 07:37 AM posted to rec.bicycles.tech
Oculus Lights
external usenet poster
 
Posts: 26
Default New B&M 100lux headlight.

On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote:
https://www.bike24.com/p2144878.html

--
JS


Biased? Its hard to be impartial all the time, but I do work on not drinking my own KoolAid, at least not too much.
Everything in my lights is my own design and final assembly.
Circuit boards are assembled in Scott's Valley from bare boards made in Illinois. The collimator is a standard part number, but from a custom run made by the manufacturer with tighter specs and tolerances than their standard part. The LEDs on the 1800Ultra are from a special kit code Cree's west coast rep got arranged for me. The 3000Extreme LEDs, so far, are from a specific reel that DigiKey has after I ordered from a few reels to see what variation there would be within a wider color temperature range, then picking what one particular trusted long term tester liked best.
The generator vs battery debate, like schrader vs presta, tubular vs clincher, has no best solution for all riders. My extended battery life in a self contained unit lighting the road better then other lights for a given burn time does give options that only generator lights could have solved before.

Note, generators can be used with Oculus.
Oculus has input holes on the main board labelled for external power inputs.. You can connect a power converter giving 3.0 - 4.2VDC into these holes. Oculus will warranty such usage. But AC pops the circuit quicker than you can say "blackout".
Oculus also works in a hybrid battery + generator mode.
Do this with a common generator to USB 5.0 - 5.1VDC output plugged into the charging jack, and run the light nearly endlessly at the third brightness, while also keeping the battery charged for when you need or want the higher brightness. Use the USB charging adapter cord listed on the Oculus website, or equivalent part sold by many electronics outlets.
  #86  
Old December 11th 17, 07:46 AM posted to rec.bicycles.tech
Oculus Lights
external usenet poster
 
Posts: 26
Default New B&M 100lux headlight.

On Sunday, December 10, 2017 at 7:34:16 PM UTC-8, Jeff Liebermann wrote:
On Mon, 11 Dec 2017 13:31:17 +1100, James
wrote:

On 10/12/17 10:40, Oculus Lights wrote:
On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote:
https://www.bike24.com/p2144878.html


My ray traces shown
on the Learn More page on the Oculus website have literally no center
spot, virtually no red dots at all, ...


https://www.barrybeams.com/learn-more.html

On the Learn More page I see a screen shot of a "computer simulation".
I assume that is of the light projected horizontally against a vertical
surface. Given that, it will not illuminate the road surface evenly at all.

I also see a picture of a supposed NASA Rover with an Oculus flood
light, that shows a bright spot just in front of the vehicle.

Is that what I was supposed to see?


I think the rover photo is intended to show how the Oculus Light
improves illumination at a distance. I don't see that on the photo. I
find it very difficult to judge intensity from an image consisting of
different white levels. To be sure, I converted the image to false
color:
http://www.11junk.com/jeffl/pics/bicycles/Front-Light-False-Color/
Original image:
http://www.11junk.com/jeffl/pics/bicycles/Front-Light-False-Color/slides/occulus-rover.html
False color using the "16 colors" LUT (look up table):
http://www.11junk.com/jeffl/pics/bicycles/Front-Light-False-Color/slides/occulus-rover-false-color.html
Note that the false colorizing assumes that the ground is uniform and
of equal reflectivity across the viewing area. I'll spare you my
opinion of the beam pattern because I'm not certain that my criteria
is the same as NASA's.

You can make your own false color images using a Java program called
ImageJ. Instructions lifted from my previous posting at:
https://groups.google.com/d/msg/rec.bicycles.tech/wPP-6f7mJOE/75h2lv1aAwAJ
https://imagej.nih.gov/ij/
Load original image.
Convert to gray scale with:
Image - Color - Channels Tool
Set it for Grayscale, which should also set it for only Channel 1.
The image should now appear in gray scale.
Convert the image to false color with:
Image - Lookup Tables
Pick an LUT (look up table). I suggest 16 colors or BRGBCMYW.

--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558


@Jeff, do you want the original NASA Roverscape instead of what you pulled off the website? Might get more even false coloration. The NASA setup is a special layout of multiple beams to create an even spread above a needed threshold, to fill a desired goal downrange and for a given width. The initial evenness of the Oculus beam allows them to be 'woven' together to get that level of evenness over a larger field. Combining multiple round beams leaves hot spots, and also needs much more power than the rover's power budget to create for the needed brightness for that large a light field.
  #87  
Old December 11th 17, 07:49 AM posted to rec.bicycles.tech
Oculus Lights
external usenet poster
 
Posts: 26
Default New B&M 100lux headlight.

On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote:
https://www.bike24.com/p2144878.html

--
JS


Biased? Its hard to be impartial all the time, but I do work on not drinking my own KoolAid, at least not too much.
Everything in my lights is my own design and final assembly.
Circuit boards are assembled in Scott's Valley from bare boards made in Illinois. The collimator is a standard part number, but from a custom run made by the manufacturer with tighter specs and tolerances than their standard part. The LEDs on the 1800Ultra are from a special kit code Cree's west coast rep got arranged for me. The 3000Extreme LEDs, so far, are from a specific reel that DigiKey has after I ordered from a few reels to see what variation there would be within a wider color temperature range, then picking what one particular trusted long term tester liked best.
The generator vs battery debate, like schrader vs presta, tubular vs clincher, has no best solution for all riders. My extended battery life in a self contained unit lighting the road better then other lights for a given burn time does give options that only generator lights could have solved before.

Note, generators can be used with Oculus.
Oculus has input holes on the main board labelled for external power inputs.. You can connect a power converter giving 3.0 - 4.2VDC into these holes. Oculus will warranty such usage. But AC pops the circuit quicker than you can say "blackout".
Oculus also works in a hybrid battery + generator mode.
Do this with a common generator to USB 5.0 - 5.1VDC output plugged into the charging jack, and run the light nearly endlessly at the third brightness, while also keeping the battery charged for when you need or want the higher brightness. Use the USB charging adapter cord listed on the Oculus website, or equivalent part sold by many electronics outlets.
  #88  
Old December 11th 17, 02:53 PM posted to rec.bicycles.tech
Frank Krygowski[_4_]
external usenet poster
 
Posts: 5,971
Default New B&M 100lux headlight.

On 12/10/2017 8:01 PM, John B. wrote:
On Sun, 10 Dec 2017 12:30:16 +0100, Sepp Ruf
wrote:

John B. wrote:
On Sat, 09 Dec 2017 19:41:16 -0600, Tim McNamara wrote:
On Sat, 9 Dec 2017 10:34:13 +0100, Sepp Ruf wrote:
Because you generally want to shield from a flattish \ line of
approaching lights, but not shield your view to the sides, the flatter
brims work better.

We're talking about cycling caps, not baseball caps. A cycling cap
bill's curve would shade the center of the field of view while allowing
peripheral vision.


True. Just use what works best for you, short of Yehuda Moon style. Our
beloved champions aren't strict either, at least after a bad (styrofoam)
hair day:
https://ekz-crosstour.ch/wp/wp-content/uploads/2017/10/RSP_1321-1024x682.jpg

Just like the curved cutoff in the awful OculuStvzo engineering sample
doesn't work...

There's no equivalence between the shape of the brim and the shape of
the cutoff. The cutoff is designed to manage outgoing light, keeping it
where it is useful and not shining it where it is not.


Not functionally equivalent, of course. You did see the video he linked?
There are only two choices with a reversed crescent cutoff: Either aim it
low enough that it does not glare directly opposing traffic, or aim it high
enough to keep the 90 and 270 degree fields of vision for fast curves.

black-tinted rear window; auto-dimming mirrors; manure-spreading trailer.

I have an auto-dimming mirror in my new car. It verges on useless as it
does not dim anywhere near enough. I'd rather have a manual mirror so
that I don't have to reach up and point the damned mirror at the ceiling
so that I'm not blinded by the vehicle behind me.

My wife's small Honda has a manual tab on the bottom of the mirror.
Flick it with your finger and the "guy behind"'s lights are focused on
the ceiling :-)


Still leaves the side mirrors vulnerable. Okay, so the trailer will need to
be wide enough to block the view, but not as wide as to require the mounting
of extra side mirrors on the Honda.


I'm not sure about side mirrors. I have them on my pickup and my
wife's little Honda has them But I don't remember ever having a
problem with them.


I sometimes have the problem, mostly on freeways. My wife even has that
problem sitting in the passenger seat. It occurs mostly when truck
drivers (pickups, box trucks, tractor-trailer rigs) have high headlights
and insist on using high beams. It's more MFFY behavior.

Our current car has electrically adjustable side mirrors. If speed
differentials are small enough that the problem persists for more than a
few seconds, I point the mirrors downward until the offender is out of
range. If they pass quickly, I just shade my side mirror with my hand.

--
- Frank Krygowski
  #89  
Old December 11th 17, 05:10 PM posted to rec.bicycles.tech
Jeff Liebermann
external usenet poster
 
Posts: 2,801
Default New B&M 100lux headlight.

On Sun, 10 Dec 2017 23:46:48 -0800 (PST), Oculus Lights
wrote:

@Jeff, do you want the original NASA Roverscape instead of what
you pulled off the website? Might get more even false coloration.


Sure, I'll give it a try. Email address is in the message signature.
Using ImageJ is easy enough and using JVA should run on Windoze, Mac,
Linux, etc. The program came from the NIH (National Institute of
Health) and was used primarily for analyzing medical microscope
photos. There is a HUGE selection of plugins to do weird things with
photographs.
https://imagej.nih.gov/ij/plugins/index.html
False coloring is only one plugin in the programs bag of tricks. The
hard part will be calibrating the intensity to false-color levels, so
that the images make sense and can be compared. I have some ideas on
how to do it, but so far, have done nothing. Also, I tried to setup a
color LUT (look up table) that will give a finer intensity resolution
in the area of interest, but the results were awful.

The NASA setup is a special layout of multiple beams to create
an even spread above a needed threshold, to fill a desired goal
downrange and for a given width. The initial evenness of the
Oculus beam allows them to be 'woven' together to get that
level of evenness over a larger field. Combining multiple
round beams leaves hot spots, and also needs much more power
than the rover's power budget to create for the needed brightness
for that large a light field.


I can guess(tm) why they need a large even beam directly in front of
the rover. There are videos of how they "drive" the machine.
https://www.jpl.nasa.gov/edu/learn/video/mars-in-a-minute-how-do-rovers-drive-on-mars/
It's not like an automobile, where everything is done in real time.
The driver (or whatever he or she is called), plots the intended path
of the rover on a computah screen. The rover then follows the dotted
line. The idea is to avoid driving into any pitfalls or running over
any obstacles. Stereo cameras give them a 3D view of the ground,
which highlights these holes and rocks. That might explain why the
lighting footprint in your photo shows lots of even light directly in
front of the rover, while everything in the distance is barely
illuminated. They need to see terrain details. From the video, the
programming seems to done when Mars is dark. If they want to program
the rover to go a longer distance, they need to see further forward.
My guess(tm) is uniform lighting at a distance is what they're asking.

You might want to modify your description under the photo on your web
pile.
"To re-light where the moon has been dark for three billion
years, NASA's Rover can see 60% farther with Oculus optics."
is not what's happening. I suggest
"NASA's rover can see details and obstacles better with
Oculus optics uniform lighting".
or something like that. Lose the 60% or someone like me might ask you
to explain why it's 60% further than what unspecified lighting system.

As for power budget, you might ask NASA if they can synchronize their
cameras to the PWM (pulse width modulation) dimming of your light.
Instead of a 100% duty cycle, the light would be on full for perhaps
10% of the time, thus drawing 1/10th the power. Essentially, it would
act like a strobe flash. If the camera frame rate is synchronized
with the strobe, it sees full brightness for a short interval, and
then nothing until the next pulse. On a real time TV, it would look
awful, but on a system designed to capture single video frames, each
image would be complete and look like it was photographed at full
power.

I hate to admit it, but this is my current idea of fun. Good luck.

--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
  #90  
Old December 11th 17, 06:32 PM posted to rec.bicycles.tech
Radey Shouman
external usenet poster
 
Posts: 1,033
Default New B&M 100lux headlight.

Frank Krygowski writes:

On 12/10/2017 8:01 PM, John B. wrote:
On Sun, 10 Dec 2017 12:30:16 +0100, Sepp Ruf
wrote:

John B. wrote:
On Sat, 09 Dec 2017 19:41:16 -0600, Tim McNamara wrote:
On Sat, 9 Dec 2017 10:34:13 +0100, Sepp Ruf wrote:


[ ... ]

black-tinted rear window; auto-dimming mirrors; manure-spreading trailer.

I have an auto-dimming mirror in my new car. It verges on useless as it
does not dim anywhere near enough. I'd rather have a manual mirror so
that I don't have to reach up and point the damned mirror at the ceiling
so that I'm not blinded by the vehicle behind me.

My wife's small Honda has a manual tab on the bottom of the mirror.
Flick it with your finger and the "guy behind"'s lights are focused on
the ceiling :-)

Still leaves the side mirrors vulnerable. Okay, so the trailer will need to
be wide enough to block the view, but not as wide as to require the mounting
of extra side mirrors on the Honda.


I'm not sure about side mirrors. I have them on my pickup and my
wife's little Honda has them But I don't remember ever having a
problem with them.


I sometimes have the problem, mostly on freeways. My wife even has
that problem sitting in the passenger seat. It occurs mostly when
truck drivers (pickups, box trucks, tractor-trailer rigs) have high
headlights and insist on using high beams. It's more MFFY behavior.


Sorry, I have to call Joerg on that one. Unless Ohio differs
surprisingly from the rest of the US you are not seeing semi truck
drivers with their brights on behind traffic. In my experience they are
really quite careful about that -- the only group of drivers who
sometimes behave that way are in the Usenet demographic, have
deteriorated night vision, and probably shouldn't be driving at all.

You are seeing low beams at roughly eye level, and I'll grant they are
obnoxiously bright, much brighter than they used to be.


Our current car has electrically adjustable side mirrors. If speed
differentials are small enough that the problem persists for more than
a few seconds, I point the mirrors downward until the offender is out
of range. If they pass quickly, I just shade my side mirror with my
hand.


--
 




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