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Inexpensive LUX meter from China to measure your bike lamp's output



 
 
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  #11  
Old February 22nd 18, 11:28 PM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 9,644
Default Inexpensive LUX meter from China to measure your bike lamp'soutput

On 2/22/2018 5:09 PM, Andre Jute wrote:
On Thursday, February 22, 2018 at 4:35:07 PM UTC, Jeff Liebermann wrote:
On Wed, 21 Feb 2018 16:52:57 -0800 (PST), Andre Jute
wrote:

Even at such an attractive price, I'm not buying the meter, Jeff.


I consider it beneficial if those recommending a product would also
have some experience using it.


See my original post at the top of the thread, where I say, "No recommendation".

For health reasons, I no longer go for those middle watches of
the night rides, as no one will go with me and it's stupid for
me to ride alone on totally empty lanes. So I have nothing
to measure for.


I have a similar problem. I don't ride at night. Too dangerous
around here and my night vision is slowly deteriorating. However,
this has not stopped me from commenting on the topic and testing
various lights.

In any event, by subjective measurement a la Roger's post,
I judge I already have what on balance I consider BUMM's best
lamp, the first series Cyo R (I also have reflectorless
version but it isn't as good in lanes as the R, and I have
the Fly-E with supposedly the same optics but with a very
nasty hotspot), so I'm not even in the market for new lamps.


Et tu Jute? I was under the delusion


I don't know any engineers with enough imagination to suffer delusions. They stop at misapprehensions. If you want to see delusions in action on a mass scale, check the so-called "resistance" in your backyard. The difference is that a misapprehension can be corrected, but a delusion is a pathology that can at best be ameliorated.

that we were discussing
instruments and methods of measuring light output and not a review of
available products. Oddly, every time (and I do mean every time) I
bring up the subject of light measurement, the discussion immediately
drifts away from measurements and gets mired on the mud flats of
anecdotal experience and subjective "calculation". It would seem that
the participants greatly fear making measurements and the assignment
of numbers to their favored bicycle headlight, as if this would
somehow diminish the value of their illuminating experience. I wonder
if it is even possible to discuss light measurements without the
apparently incurable product endorsements, which incidentally is only
slightly less prevalent in the flashlight forums.


Oh, I don't back away from abstractions where relevant. But, on a "tech" conference with a predominantly American membership, what do you expect? Thoughtful hotrodders? Pull the other one.

I only need one tool. Anything within reach can be used as a hammer.


You and Clarkson both. I'm an intellectual: as a reflex, I reach for my trusty Pickett pocket slide rule. The saddle-leather slipcase is worn almost yellow, but I feel naked without it, and they don't make them like that any more, though my favorite everyday watch, which is decades younger, has a perfectly good rotary slide rule on its bezels as a backup:
http://coolmainpress.com/andrejutewatches.html#Navihawk


Andre Jute
God bless the instrument makers



You're right, The Resistance is a bunch of loons:
http://socialistresistance.org/brexi...e-goes-on/8534

And not just that one either!
https://www.theguardian.com/politics...dence-movement

Even those amiable Canadians went through their own:
http://mhs.mb.ca/docs/mb_history/29/...sistance.shtml

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Ads
  #12  
Old February 23rd 18, 12:23 AM posted to rec.bicycles.tech
Oculus Lights[_2_]
external usenet poster
 
Posts: 29
Default Inexpensive LUX meter from China to measure your bike lamp's output

On Tuesday, February 20, 2018 at 8:32:03 PM UTC-8, Andre Jute wrote:
Inexpensive LUX meter from China to measure your bike lamp's output. Stumbled across this while I was looking for something else. No recommendation, but I remembered you guys were discussing lux ratings not too long ago.

https://www.aliexpress.com/store/pro...4b9c46a0WLmNTx

Andre Jute
Always helpful


All a lux number tells you is how bright the light is at that given point and distance. Without a distance, and an overall beam field measurement and various points in teh besm spread, its meaningless.
  #13  
Old February 23rd 18, 01:12 AM posted to rec.bicycles.tech
Andre Jute[_2_]
external usenet poster
 
Posts: 8,704
Default Inexpensive LUX meter from China to measure your bike lamp's output

On Thursday, February 22, 2018 at 11:28:56 PM UTC, AMuzi wrote:
On 2/22/2018 5:09 PM, Andre Jute wrote:
On Thursday, February 22, 2018 at 4:35:07 PM UTC, Jeff Liebermann wrote:
On Wed, 21 Feb 2018 16:52:57 -0800 (PST), Andre Jute
wrote:

Even at such an attractive price, I'm not buying the meter, Jeff.

I consider it beneficial if those recommending a product would also
have some experience using it.


See my original post at the top of the thread, where I say, "No recommendation".

For health reasons, I no longer go for those middle watches of
the night rides, as no one will go with me and it's stupid for
me to ride alone on totally empty lanes. So I have nothing
to measure for.

I have a similar problem. I don't ride at night. Too dangerous
around here and my night vision is slowly deteriorating. However,
this has not stopped me from commenting on the topic and testing
various lights.

In any event, by subjective measurement a la Roger's post,
I judge I already have what on balance I consider BUMM's best
lamp, the first series Cyo R (I also have reflectorless
version but it isn't as good in lanes as the R, and I have
the Fly-E with supposedly the same optics but with a very
nasty hotspot), so I'm not even in the market for new lamps.

Et tu Jute? I was under the delusion


I don't know any engineers with enough imagination to suffer delusions. They stop at misapprehensions. If you want to see delusions in action on a mass scale, check the so-called "resistance" in your backyard. The difference is that a misapprehension can be corrected, but a delusion is a pathology that can at best be ameliorated.

that we were discussing
instruments and methods of measuring light output and not a review of
available products. Oddly, every time (and I do mean every time) I
bring up the subject of light measurement, the discussion immediately
drifts away from measurements and gets mired on the mud flats of
anecdotal experience and subjective "calculation". It would seem that
the participants greatly fear making measurements and the assignment
of numbers to their favored bicycle headlight, as if this would
somehow diminish the value of their illuminating experience. I wonder
if it is even possible to discuss light measurements without the
apparently incurable product endorsements, which incidentally is only
slightly less prevalent in the flashlight forums.


Oh, I don't back away from abstractions where relevant. But, on a "tech" conference with a predominantly American membership, what do you expect? Thoughtful hotrodders? Pull the other one.

I only need one tool. Anything within reach can be used as a hammer.


You and Clarkson both. I'm an intellectual: as a reflex, I reach for my trusty Pickett pocket slide rule. The saddle-leather slipcase is worn almost yellow, but I feel naked without it, and they don't make them like that any more, though my favorite everyday watch, which is decades younger, has a perfectly good rotary slide rule on its bezels as a backup:
http://coolmainpress.com/andrejutewatches.html#Navihawk


Andre Jute
God bless the instrument makers



You're right, The Resistance is a bunch of loons:
http://socialistresistance.org/brexi...e-goes-on/8534

And not just that one either!
https://www.theguardian.com/politics...dence-movement

Even those amiable Canadians went through their own:
http://mhs.mb.ca/docs/mb_history/29/...sistance.shtml

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Gee, Andrew, I didn't even know about those. How depressing. Mind you, for Americans it is probably good news to discover they aren't the only nation to harbour a large hysterical and infantile, anti-democratic part of the total population.

Andre Jute
Fair to a fault
  #14  
Old February 23rd 18, 01:19 AM posted to rec.bicycles.tech
Andre Jute[_2_]
external usenet poster
 
Posts: 8,704
Default Inexpensive LUX meter from China to measure your bike lamp's output

On Friday, February 23, 2018 at 12:23:26 AM UTC, Oculus Lights wrote:
On Tuesday, February 20, 2018 at 8:32:03 PM UTC-8, Andre Jute wrote:
Inexpensive LUX meter from China to measure your bike lamp's output. Stumbled across this while I was looking for something else. No recommendation, but I remembered you guys were discussing lux ratings not too long ago.

https://www.aliexpress.com/store/pro...4b9c46a0WLmNTx

Andre Jute
Always helpful


All a lux number tells you is how bright the light is at that given point and distance. Without a distance, and an overall beam field measurement and various points in teh besm spread, its meaningless.


Absolutely. Those points have already been made and a solution offered by Jeff Liebermann. Try the second post in this thread.

Andre Jute
Ditto
  #15  
Old February 23rd 18, 01:19 AM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 9,644
Default Inexpensive LUX meter from China to measure your bike lamp'soutput

On 2/22/2018 7:12 PM, Andre Jute wrote:
On Thursday, February 22, 2018 at 11:28:56 PM UTC, AMuzi wrote:
On 2/22/2018 5:09 PM, Andre Jute wrote:
On Thursday, February 22, 2018 at 4:35:07 PM UTC, Jeff Liebermann wrote:
On Wed, 21 Feb 2018 16:52:57 -0800 (PST), Andre Jute
wrote:

Even at such an attractive price, I'm not buying the meter, Jeff.

I consider it beneficial if those recommending a product would also
have some experience using it.

See my original post at the top of the thread, where I say, "No recommendation".

For health reasons, I no longer go for those middle watches of
the night rides, as no one will go with me and it's stupid for
me to ride alone on totally empty lanes. So I have nothing
to measure for.

I have a similar problem. I don't ride at night. Too dangerous
around here and my night vision is slowly deteriorating. However,
this has not stopped me from commenting on the topic and testing
various lights.

In any event, by subjective measurement a la Roger's post,
I judge I already have what on balance I consider BUMM's best
lamp, the first series Cyo R (I also have reflectorless
version but it isn't as good in lanes as the R, and I have
the Fly-E with supposedly the same optics but with a very
nasty hotspot), so I'm not even in the market for new lamps.

Et tu Jute? I was under the delusion

I don't know any engineers with enough imagination to suffer delusions. They stop at misapprehensions. If you want to see delusions in action on a mass scale, check the so-called "resistance" in your backyard. The difference is that a misapprehension can be corrected, but a delusion is a pathology that can at best be ameliorated.

that we were discussing
instruments and methods of measuring light output and not a review of
available products. Oddly, every time (and I do mean every time) I
bring up the subject of light measurement, the discussion immediately
drifts away from measurements and gets mired on the mud flats of
anecdotal experience and subjective "calculation". It would seem that
the participants greatly fear making measurements and the assignment
of numbers to their favored bicycle headlight, as if this would
somehow diminish the value of their illuminating experience. I wonder
if it is even possible to discuss light measurements without the
apparently incurable product endorsements, which incidentally is only
slightly less prevalent in the flashlight forums.

Oh, I don't back away from abstractions where relevant. But, on a "tech" conference with a predominantly American membership, what do you expect? Thoughtful hotrodders? Pull the other one.

I only need one tool. Anything within reach can be used as a hammer.

You and Clarkson both. I'm an intellectual: as a reflex, I reach for my trusty Pickett pocket slide rule. The saddle-leather slipcase is worn almost yellow, but I feel naked without it, and they don't make them like that any more, though my favorite everyday watch, which is decades younger, has a perfectly good rotary slide rule on its bezels as a backup:
http://coolmainpress.com/andrejutewatches.html#Navihawk


Andre Jute
God bless the instrument makers



You're right, The Resistance is a bunch of loons:
http://socialistresistance.org/brexi...e-goes-on/8534

And not just that one either!
https://www.theguardian.com/politics...dence-movement

Even those amiable Canadians went through their own:
http://mhs.mb.ca/docs/mb_history/29/...sistance.shtml



Gee, Andrew, I didn't even know about those. How depressing. Mind you, for Americans it is probably good news to discover they aren't the only nation to harbour a large hysterical and infantile, anti-democratic part of the total population.

Andre Jute
Fair to a fault


'resistance':

It's often quipped that if half the French who claimed to
resist the Vichy regime actually did, they would have won.
--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


  #16  
Old February 23rd 18, 04:14 AM posted to rec.bicycles.tech
Jeff Liebermann
external usenet poster
 
Posts: 2,833
Default Inexpensive LUX meter from China to measure your bike lamp's output

On Thu, 22 Feb 2018 15:09:34 -0800 (PST), Andre Jute
wrote:

On Thursday, February 22, 2018 at 4:35:07 PM UTC, Jeff Liebermann wrote:
On Wed, 21 Feb 2018 16:52:57 -0800 (PST), Andre Jute
wrote:

Even at such an attractive price, I'm not buying the meter, Jeff.


I consider it beneficial if those recommending a product would also
have some experience using it.


See my original post at the top of the thread, where I say, "No recommendation".


Argh. My apologies. I missed the disclaimer.

Et tu Jute? I was under the delusion


I don't know any engineers with enough imagination to suffer
delusions. They stop at misapprehensions. If you want to see
delusions in action on a mass scale, check the so-called "resistance"
in your backyard. The difference is that a misapprehension can
be corrected, but a delusion is a pathology that can at best be
ameliorated.


Delusion:
an idiosyncratic belief or impression that is firmly maintained
despite being contradicted by what is generally accepted as
reality or rational argument, typically a symptom of mental
disorder.

To succeed and survive in engineering, one must develop the abilities
to concentrate on a problem, not be diverted from the task at hand,
and to trust one's instincts, even if they run across the grain. In
other words, engineers run on arrogance, egotism, and self confidence.
If the engineers which you know lack these attributes, I would suspect
they're either not functioning in an engineering capacity, or have
morphed into management.

Depending on your point of view in any difference of opinion, the most
outspoken advocate of the opposite point of view is by definition
delusional.

... I wonder
if it is even possible to discuss light measurements without the
apparently incurable product endorsements, which incidentally is only
slightly less prevalent in the flashlight forums.


Oh, I don't back away from abstractions where relevant.


No, but you do change the subject, divert the discussion, and
otherwise avoid the original topic, which involves measuring lumens,
and not psychobabble. At least you've demonstrated that I was correct
in suspecting that it is pathologically impossible to stay on topic.

But, on a "tech" conference with a predominantly American membership,
what do you expect? Thoughtful hotrodders? Pull the other one.


I don't attend tech conferences. It's not that I don't want to
attend. It's that they done want me there as I tend to be rather
disruptive.

I only need one tool. Anything within reach can be used as a
hammer.


You and Clarkson both.


Is that Jeremy Clarkson? If so, at 6ft 5" (196 cm) tall, I don't see
how he fits in some of the smaller vehicles he berates on his show(s).
It's amazing what can be successfully accomplished with a hammer.

I'm an intellectual: as a reflex, I reach for my trusty Pickett
pocket slide rule. The saddle-leather slipcase is worn almost yellow,
but I feel naked without it, and they don't make them like that
any more...


Yech. Pickett slide rules were awful. However, they did make some
specialized electronic and microwave slide rules, that I wouldn't mind
having. Basically, a cheat sheet on the back of the slide rule:
http://www.sliderulemuseum.com/Pickett/Pickett_N515-T_Electronic_CIE_DonatedbyAndyKeller.jpg
http://www.sliderulemuseum.com/Pickett.htm

K&E are better:
http://www.learnbydestroying.com/jeffl/pics/slide-rule/slide-rule.jpg
Old photo. I have a few more along with a small pile of paper and
plastic slide rules:
http://www.learnbydestroying.com/jeffl/crud/Paper-Slide-Rule-Calculators.jpg
http://www.learnbydestroying.com/jeffl/crud/Paper-Slide-Rule-Calculators-02.jpg
The 6" K&E managed to get me through 6 years of college. For
specialized calculations, the paper slide rules are quite useful.

though my favorite everyday watch, which is decades younger,
has a perfectly good rotary slide rule on its bezels as a backup:
http://coolmainpress.com/andrejutewatches.html#Navihawk


Impressive. I can almost see the numbers. I have a cell phone, so I
don't need or wear a watch.

God bless the instrument makers


Most are now made in China. God save the domestic instrument makers.

--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
  #17  
Old February 23rd 18, 06:02 AM posted to rec.bicycles.tech
Tosspot[_3_]
external usenet poster
 
Posts: 1,178
Default Inexpensive LUX meter from China to measure your bike lamp'soutput

On 22/02/18 09:13, Andre Jute wrote:
On Thursday, February 22, 2018 at 6:16:19 AM UTC, Frank Leake wrote:
On 22/02/18 01:52, Andre Jute wrote:

snip

In any event, by subjective measurement a la Roger's post, I
judge I already have what on balance I consider BUMM's best lamp,
the first series Cyo R (I also have reflectorless version but it
isn't as good in lanes as the R, and I have the Fly-E with
supposedly the same optics but with a very nasty hotspot), so I'm
not even in the market for new lamps.


Three of those dies before I gave up on them, all inside 18 months
each.


You want to be careful what you say here, Frank. The slightest
suspicion that you think every BUMM lamp, including the ancient
lethal glimmerers, were not Immaculately Conceived by the Great
Engineer, and the BUMMbuddies will hound you for months
foryourheresy.


I'm riding the IQ-X atm, the finest light Bumm produced after the IQ-Fly
imho.

Neither of my Cyo have failed. But then I don't mount them upside
down, so the rain can get in, or mount them at hub level, or ride
fast enough through deep puddles to splash up water into the innards
through the wire entry. That lack of waterproofing is just one of the
inadequate things about BUMM lamps you're not supposed to mention in
polite circles...

Do you go out in the rain much?


I live in Ireland, so you'd expect the answer to be "yes". In fact, I
rarely ride through more than light showers, in part because the
weather forecasts are now so good, it's no problem to pick a clear
hour or two for short rides. The truth is that in the last few years
I've become more concerned with whether my cycling jackets are
windproof than whether they're stormproof.


Innesreting. I don't know, but I strongly suspected water ingress
killed them. Only Bumm light I've ever had issues with.

Andre Jute Bring back global warming!


It never went away!
  #18  
Old February 23rd 18, 08:16 AM posted to rec.bicycles.tech
Oculus Lights[_2_]
external usenet poster
 
Posts: 29
Default Inexpensive LUX meter from China to measure your bike lamp's output

On Tuesday, February 20, 2018 at 8:32:03 PM UTC-8, Andre Jute wrote:
Inexpensive LUX meter from China to measure your bike lamp's output. Stumbled across this while I was looking for something else. No recommendation, but I remembered you guys were discussing lux ratings not too long ago.

https://www.aliexpress.com/store/pro...4b9c46a0WLmNTx

Andre Jute
Always helpful


My lux meter is a calibrated Triplett multimeter that cost ~$190, with a 5mm x 1 cm oval sensor for accurate point measurements in beam targets that don't describe a region like a square cm, they only state a "point" like the B bright spot on the STVZO specs. My targets are 5mm squares, that I measure at 10 meters, measured to within .5cm distance at the horizontal to the B spot. Btw for those into innuendo, yes the spec has a G spot, just to the right of the F spot.

The real measure of visibility does come in lumen measurements, the problem in inflated test methods. The realistic measure of visibility comes in Beam Lumens and Field Lumens. This is like Olympic scoring. Throw away the low, throw away the high. For Beam Luens, only count mmlumens where the lux measure is at least half of the maximum. For Field Lumens, only count where the lux is at least 10% of max. At least 25% of a common big Night Rider is less than 10 of the max. Light and Motion does better, but still has hot spots in the center and too much dim fade on the edges. Usable visibility on the Oculus is amazing compared to any other, because I project a beam evenly downrange, yet without a bright hotspot that the eye fixates and stops down to. Thus the eye sees evenly downrange far better than other lights care capable of. Put another way, lumen counts aren't always inflated.. But where the lumens go is not considered in the standard way that bike lights are tested. This despicable FL1 spec that only declares total lumens is demonic creation of the industry itself to legitimize the racket they know they're pulling on everyone's eyes, so that they can include all their "crap" lumens, the dim junk that the eye filters out as too dim and too far out into the peripheral vision, along with the bloated bright spot where countless lumens are wasted, they eye tuning down to compensate for the overly bright center spot so that you only really can see what the bright spot covers, like overstuffing a dartboard with so many darts on the bullseye that no other darts anywhere else on the dartboard matter in your score.
Oculus lights up where your eyes want to see, evenly, with enough light so that its not too bright where the eye would have to dim down, nor too dim that its wasted because its not in your field of central plus some peripheral vision that you want and need to see in when operating a moving vehicle.
Its why NASA is using my optics for the lunar rover, despite other systems giving a brighter total measurable light output, because light rays only count where you can see and process them, not overstuffed and wasted in the center where you can see already with a much lower lux level, nor wasted on the sides where its too dim to process, so why waste precious electricity from the batteries to send lumens out where your vision systems can't detect and process?
  #19  
Old February 23rd 18, 09:09 AM posted to rec.bicycles.tech
Andre Jute[_2_]
external usenet poster
 
Posts: 8,704
Default Inexpensive LUX meter from China to measure your bike lamp's output

On Friday, February 23, 2018 at 8:16:58 AM UTC, Oculus Lights wrote:
On Tuesday, February 20, 2018 at 8:32:03 PM UTC-8, Andre Jute wrote:
Inexpensive LUX meter from China to measure your bike lamp's output. Stumbled across this while I was looking for something else. No recommendation, but I remembered you guys were discussing lux ratings not too long ago.

https://www.aliexpress.com/store/pro...4b9c46a0WLmNTx

Andre Jute
Always helpful


My lux meter is a calibrated Triplett multimeter that cost ~$190, with a 5mm x 1 cm oval sensor for accurate point measurements in beam targets that don't describe a region like a square cm, they only state a "point" like the B bright spot on the STVZO specs. My targets are 5mm squares, that I measure at 10 meters, measured to within .5cm distance at the horizontal to the B spot. Btw for those into innuendo, yes the spec has a G spot, just to the right of the F spot.

The real measure of visibility does come in lumen measurements, the problem in inflated test methods. The realistic measure of visibility comes in Beam Lumens and Field Lumens. This is like Olympic scoring. Throw away the low, throw away the high. For Beam Luens, only count mmlumens where the lux measure is at least half of the maximum. For Field Lumens, only count where the lux is at least 10% of max. At least 25% of a common big Night Rider is less than 10 of the max. Light and Motion does better, but still has hot spots in the center and too much dim fade on the edges. Usable visibility on the Oculus is amazing compared to any other, because I project a beam evenly downrange, yet without a bright hotspot that the eye fixates and stops down to. Thus the eye sees evenly downrange far better than other lights care capable of. Put another way, lumen counts aren't always inflated. But where the lumens go is not considered in the standard way that bike lights are tested. This despicable FL1 spec that only declares total lumens is demonic creation of the industry itself to legitimize the racket they know they're pulling on everyone's eyes, so that they can include all their "crap" lumens, the dim junk that the eye filters out as too dim and too far out into the peripheral vision, along with the bloated bright spot where countless lumens are wasted, they eye tuning down to compensate for the overly bright center spot so that you only really can see what the bright spot covers, like overstuffing a dartboard with so many darts on the bullseye that no other darts anywhere else on the dartboard matter in your score.
Oculus lights up where your eyes want to see, evenly, with enough light so that its not too bright where the eye would have to dim down, nor too dim that its wasted because its not in your field of central plus some peripheral vision that you want and need to see in when operating a moving vehicle..
Its why NASA is using my optics for the lunar rover, despite other systems giving a brighter total measurable light output, because light rays only count where you can see and process them, not overstuffed and wasted in the center where you can see already with a much lower lux level, nor wasted on the sides where its too dim to process, so why waste precious electricity from the batteries to send lumens out where your vision systems can't detect and process?


Yo, Barry, while I'm happy to have a detailed explanation of a better method, there's no great gain in telling me. I believe you. I agree with you. I've said for years that the lamp manufacturers are a bunch of lying sharks. I called them out by name.

Andre Jute
Onside
  #20  
Old February 23rd 18, 09:32 AM posted to rec.bicycles.tech
Andre Jute[_2_]
external usenet poster
 
Posts: 8,704
Default Inexpensive LUX meter from China to measure your bike lamp's output

On Friday, February 23, 2018 at 6:02:07 AM UTC, Frank Leake wrote:
On 22/02/18 09:13, Andre Jute wrote:
On Thursday, February 22, 2018 at 6:16:19 AM UTC, Frank Leake wrote:
On 22/02/18 01:52, Andre Jute wrote:

snip

In any event, by subjective measurement a la Roger's post, I
judge I already have what on balance I consider BUMM's best lamp,
the first series Cyo R (I also have reflectorless version but it
isn't as good in lanes as the R, and I have the Fly-E with
supposedly the same optics but with a very nasty hotspot), so I'm
not even in the market for new lamps.

Three of those dies before I gave up on them, all inside 18 months
each.


You want to be careful what you say here, Frank. The slightest
suspicion that you think every BUMM lamp, including the ancient
lethal glimmerers, were not Immaculately Conceived by the Great
Engineer, and the BUMMbuddies will hound you for months
foryourheresy.


I'm riding the IQ-X atm, the finest light Bumm produced after the IQ-Fly
imho.


I have an IQ-FLY-E. It has a nasty hotspot that makes it a real migraine generator as my eyes try to adapt. See Barry's Oculus expo about the reaction of the eye below; despite what you may have heard here from idiots like McNamara and Krygowski, who aren't exactly famed for sticking to the truth in the heat of an argument, or any other time, Barry's got the psychology of the eye spot on (I'm by training a psychologist and an economist). Piccie of the hotspot on the Fly E at http://coolmainpress.com/BICYCLINGbuildingpedelec6.html
It would be an excellent bicycle lamp without the hotspot.

Innesreting. I don't know, but I strongly suspected water ingress
killed them. Only Bumm light I've ever had issues with.


Water ingress through the unprotected hole where the wires enter at the bottom of the lamp is a well-known failure mode among touring bicyclists for the Cyo and quite a few other BUMM lamps. On other conferences I belong to, newbies are usually told not to mount the lamps at hub level, or upside down, or to submerge to lamp in river crossings, or to direct a power wash at the lamp without blocking the hole, etc. I can't say I'm actually worried about losing a lamp; you're the first person I've heard of who's been so serious unlucky.

Andre Jute Bring back global warming!


It never went away!


And explanations for why it is not only invisible but intrinsically undetectable will match in ridicule those at the beginning of the last century for why the "ether" supporting all wavesforms including interstellar light was invisible, indeed undetectable.

Andre Jute
Being a cyclist doesn't mean you have to park your brain for the duration
 




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