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Main
Date: 04 Nov 2007 19:58:42
From: BobT
Subject: Busch and Muller Lumotec IQ Fly
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Anyone have any experience with the Busch and Muller Lumotec IQ Fly
headlamp?
I live in the U.S.A. where, I best as I can tell, they are not yet
available.
I am considering rearranging the lights on my touring/commuter bike that has
a Schimdt hub dynamo.
How is the brightness on the road compared to a orignal Lumotec Round
halogen headlight. I note that the B&M website shows 17 lumens for this
halogen light and 40 lumens for the IQ fly. Does the more than double bulb
luminosity translate to proportional that much more light on the road?
How would the IQ fly compare to a Schmidt E6 headlamp? In my experience (in
an unscientific test with my eyeballs) the E6 puts much more light on the
road than the B&M Lumotec round halogen light.
BobT
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Date: 05 Nov 2007 15:33:39
From:
Subject: Color of light [was Re: Busch and Muller Lumotec IQ Fly]
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On Nov 5, 3:37 am, M-gineering <ikmotgeens...@m-gineering.nl > wrote:
>
>
>In rain & drizzle the LED light colour
> seems to my eyes to be a lot less effective than a halogen bulb.
That's interesting. Can you comment on the color of the light as seen
by an approaching driver? Does it have the bluish tinge that most
"white" LEDs seem to have?
I've read that blue light tends to refract and scatter within the
human eye more than yellow light does. I wonder if that's part of the
reason for what you saw.
And of course, there are the yellow French headlights, yellow fog
lamps, and yellow "dim light" shooters' glasses, all purported to have
advantages in penetration.
Are we losing something by moving to whiter, or "bluer" lights?
- Frank Krygowski
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Date: 06 Nov 2007 06:16:31
From: Dorfus Dippintush
Subject: Re: Color of light [was Re: Busch and Muller Lumotec IQ Fly]
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frkrygow@gmail.com wrote:
> On Nov 5, 3:37 am, M-gineering <ikmotgeens...@m-gineering.nl> wrote:
>>
>> In rain & drizzle the LED light colour
>> seems to my eyes to be a lot less effective than a halogen bulb.
>
> That's interesting. Can you comment on the color of the light as seen
> by an approaching driver? Does it have the bluish tinge that most
> "white" LEDs seem to have?
>
> I've read that blue light tends to refract and scatter within the
> human eye more than yellow light does. I wonder if that's part of the
> reason for what you saw.
>
> And of course, there are the yellow French headlights, yellow fog
> lamps, and yellow "dim light" shooters' glasses, all purported to have
> advantages in penetration.
>
> Are we losing something by moving to whiter, or "bluer" lights?
>
> - Frank Krygowski
>
Try wearing yellow tinted glasses to replicate the effect.
Dorf
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Date: 05 Nov 2007 17:20:47
From: M-gineering
Subject: Re: Color of light [was Re: Busch and Muller Lumotec IQ Fly]
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frkrygow@gmail.com wrote:
> On Nov 5, 3:37 am, M-gineering <ikmotgeens...@m-gineering.nl> wrote:
>>
>> In rain & drizzle the LED light colour
>> seems to my eyes to be a lot less effective than a halogen bulb.
>
> That's interesting. Can you comment on the color of the light as seen
> by an approaching driver? Does it have the bluish tinge that most
> "white" LEDs seem to have?
>
The light itself is very cool white, nu blueish tinge but no yellow or
reds either.
> I've read that blue light tends to refract and scatter within the
> human eye more than yellow light does. I wonder if that's part of the
> reason for what you saw.
Isn't the human eye more sentitive for reds? (ISTR that it would have
been better for cars to have red lights up front and white's at the
rear, but that changing over was to difficult ;) )Anyhow in rainy
conditions you get a lot of glare from puddles and raindrops and the
contrast or colour difference between black tarmac, grass, shadows and
dirt disappears
>
> Are we losing something by moving to whiter, or "bluer" lights?
LED light is fairly monochromatic. Loads of males are colourblind. It
would be interesting to see if it benefits everyone equally
--
/Marten
info(apestaartje)m-gineering(punt)nl
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Date: 05 Nov 2007 17:15:31
From: Michael Press
Subject: Re: Color of light [was Re: Busch and Muller Lumotec IQ Fly]
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In article <fgnftd$53r$1@localhost.localdomain >,
M-gineering <ikmotgeenspam@m-gineering.nl > wrote:
> Isn't the human eye more sentitive for reds? (ISTR that it would have
> been better for cars to have red lights up front and white's at the
> rear, but that changing over was to difficult ;) )Anyhow in rainy
> conditions you get a lot of glare from puddles and raindrops and the
> contrast or colour difference between black tarmac, grass, shadows and
> dirt disappears
Least sensitive to red.
Furthermore red is the least energetic end of our
visible spectrum. Red light is least inimical to
the dark adapted eye.
--
Michael Press
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Date: 05 Nov 2007 17:26:27
From: Tim McNamara
Subject: Re: Color of light [was Re: Busch and Muller Lumotec IQ Fly]
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M-gineering wrote:
> frkrygow@gmail.com wrote:
>> On Nov 5, 3:37 am, M-gineering <ikmotgeens...@m-gineering.nl>
>> wrote:
>>>
>>> In rain & drizzle the LED light colour seems to my eyes to be a
>>> lot less effective than a halogen bulb.
>>
>> That's interesting. Can you comment on the color of the light as
>> seen by an approaching driver? Does it have the bluish tinge that
>> most "white" LEDs seem to have?
>
> The light itself is very cool white, nu blueish tinge but no yellow
> or reds either.
>
>> I've read that blue light tends to refract and scatter within the
>> human eye more than yellow light does. I wonder if that's part of
>> the reason for what you saw.
>
> Isn't the human eye more sentitive for reds? (ISTR that it would have
> been better for cars to have red lights up front and white's at the
> rear, but that changing over was to difficult ;) )Anyhow in rainy
> conditions you get a lot of glare from puddles and raindrops and the
> contrast or colour difference between black tarmac, grass, shadows
> and dirt disappears
The dark-adapted human eye is most sensitive to green light (507 nm).
Night vision (rods) does not perceive red, which is why astronomers use
red light at night to read star charts and the like- it minimally
affects dark adaptation. In daylight our eyes are most sensitive to
blue light 555 nm.
>> Are we losing something by moving to whiter, or "bluer" lights?
>
>
> LED light is fairly monochromatic. Loads of males are colourblind. It
> would be interesting to see if it benefits everyone equally
ISTR that blue light scatters more easily in air, fog, particulates, etc.
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Date: 05 Nov 2007 05:40:50
From:
Subject: Re: Busch and Muller Lumotec IQ Fly
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On Nov 4, 8:58 pm, "BobT" <RobertLeeTaylor...@THISSuddenLink.net >
wrote:
> Anyone have any experience with the Busch and Muller Lumotec IQ Fly
> headlamp?
> I live in the U.S.A. where, I best as I can tell, they are not yet
> available.
>
> I am considering rearranging the lights on my touring/commuter bike that has
> a Schimdt hub dynamo.
>
> How is the brightness on the road compared to a orignal Lumotec Round
> halogen headlight. I note that the B&M website shows 17 lumens for this
> halogen light and 40 lumens for the IQ fly. Does the more than double bulb
> luminosity translate to proportional that much more light on the road?
>
> How would the IQ fly compare to a Schmidt E6 headlamp? In my experience (in
> an unscientific test with my eyeballs) the E6 puts much more light on the
> road than the B&M Lumotec round halogen light.
>
> BobT
I think the information you want is in the thread at
http://forum.ctc.org.uk/viewtopic.php?t=8685&postdays=0&postorder=asc&start=15
or http://tinyurl.com/2oak98
Pay special attention to Chris Juden's reply at the bottom of that
page. He's probably the most renowned bike tech guy in Britain.
Quotes:
"It is subjectively a step-change brighter (an f-stop or two) than the
best halogen bulb dynamo lamps I've used. "
"The beam is the closest thing to a dipped car headlamp I've yet seen
on a bike: progressively brighter and fanning out towards the top and
then cutting off very sharply. Horizontal alignment is critical, but
get it right and you can illuminate the road, ooh at least 100m ahead,
without dazzling oncoming drivers. There is nevertheless enough upward
scatter to make them dip (some even slow down!) and reflect from
roadsigns up-a-pole. "
"Thanks to the more accurate and task-specific focussing, compared to
the simple cone of light you get from most LED lamps, less light is
wasted in the sky etc. and although this unit has only the
standardised 2.4W to go on, I find it more effective than battery
driven LED lamps of more than double the electrical power. "
It sounds pretty darn good!
- Frank Krygowski
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Date: 05 Nov 2007 09:37:08
From: M-gineering
Subject: Re: Busch and Muller Lumotec IQ Fly
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frkrygow@gmail.com wrote:
> On Nov 4, 8:58 pm, "BobT" <RobertLeeTaylor...@THISSuddenLink.net>
> wrote:
>> Anyone have any experience with the Busch and Muller Lumotec IQ Fly
>> headlamp?
>> I live in the U.S.A. where, I best as I can tell, they are not yet
>> available.
>>
>> I am considering rearranging the lights on my touring/commuter bike that has
>> a Schimdt hub dynamo.
>>
>> How is the brightness on the road compared to a orignal Lumotec Round
>> halogen headlight. I note that the B&M website shows 17 lumens for this
>> halogen light and 40 lumens for the IQ fly. Does the more than double bulb
>> luminosity translate to proportional that much more light on the road?
>>
>> How would the IQ fly compare to a Schmidt E6 headlamp? In my experience (in
>> an unscientific test with my eyeballs) the E6 puts much more light on the
>> road than the B&M Lumotec round halogen light.
>>
>> BobT
>
> I think the information you want is in the thread at
> http://forum.ctc.org.uk/viewtopic.php?t=8685&postdays=0&postorder=asc&start=15
> or http://tinyurl.com/2oak98
>
> Pay special attention to Chris Juden's reply at the bottom of that
> page. He's probably the most renowned bike tech guy in Britain.
>
> Quotes:
>
> "It is subjectively a step-change brighter (an f-stop or two) than the
> best halogen bulb dynamo lamps I've used. "
>
> "The beam is the closest thing to a dipped car headlamp I've yet seen
> on a bike: progressively brighter and fanning out towards the top and
> then cutting off very sharply. Horizontal alignment is critical, but
> get it right and you can illuminate the road, ooh at least 100m ahead,
> without dazzling oncoming drivers. There is nevertheless enough upward
> scatter to make them dip (some even slow down!) and reflect from
> roadsigns up-a-pole. "
>
> "Thanks to the more accurate and task-specific focussing, compared to
> the simple cone of light you get from most LED lamps, less light is
> wasted in the sky etc. and although this unit has only the
> standardised 2.4W to go on, I find it more effective than battery
> driven LED lamps of more than double the electrical power. "
>
> It sounds pretty darn good!
>
> - Frank Krygowski
>
It is pretty nice, and on standlight it just keeps blazing away. In fact
you could probably use it for offroad excursions!
My impression sofar is that you can't see as far away with it as with an
E6, probably because there is so much more light in the foreground. At
20m the light just hits a wall. In rain & drizzle the LED light colour
seems to my eyes to be a lot less effective than a halogen bulb. The
angle adjustment of the lamp has three positions: sky, fronthub and in
between. For a commuter it is probably the best dynolight available at
the moment
--
/Marten
info(apestaartje)m-gineering(punt)nl
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Date: 04 Nov 2007 21:31:16
From: Hank Wirtz
Subject: Re: Busch and Muller Lumotec IQ Fly
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On Nov 4, 5:58 pm, "BobT" <RobertLeeTaylor...@THISSuddenLink.net >
wrote:
> Anyone have any experience with the Busch and Muller Lumotec IQ Fly
> headlamp?
> I live in the U.S.A. where, I best as I can tell, they are not yet
> available.
>
> I am considering rearranging the lights on my touring/commuter bike that has
> a Schimdt hub dynamo.
>
> How is the brightness on the road compared to a orignal Lumotec Round
> halogen headlight. I note that the B&M website shows 17 lumens for this
> halogen light and 40 lumens for the IQ fly. Does the more than double bulb
> luminosity translate to proportional that much more light on the road?
>
> How would the IQ fly compare to a Schmidt E6 headlamp? In my experience (in
> an unscientific test with my eyeballs) the E6 puts much more light on the
> road than the B&M Lumotec round halogen light.
>
> BobT
Mine should be arriving sometime this week. At least, I got
notification that it shipped on Thursday from SJS Cycles in England,
and it's coming via Air Mail, so I'm hoping it's not much more than a
week. I will report back with comparisons to my usual light, the
DLumotec Oval Senso Plus (LED).
And the measurements given are in Lux, not Lumen. Lux is Lumen times
area (or as my brother the physics major put it, "photonic pressure"),
so if their measurements are accurate, then yes, it should be that
much more light on the road.
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