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"white" LED's vs. incandescent and halogen lights



 
 
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  #41  
Old December 9th 09, 08:31 PM posted to rec.bicycles.misc,rec.bicycles.tech
smharding
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Posts: 23
Default "white" LED's vs. incandescent and halogen lights

Frank Krygowski wrote:
On Dec 9, 6:45 am, smharding wrote:

I just swapped out my 2.4/3W halogen B&M headlight for a new LED type
that I believe is a mere 1W. The LED is superior in several ways:

-- It comes to full brightness at a couple mph. The halogen
didn't get fired up until perhaps 5 mph. This is a generator
driven light system.
-- The light provided is much better for my on road commuting.
The lense shapes the light into a nice bright long rectangle
in front of me making an excellently lighted focused area in
front of me.
-- The halogen bulbs burned out fairly soon. I believe the Philips
bulb is only good for about 100 hours of burn time. The new LED
is alleged to be good for 100,000 hours, so I shouldn't have to
replace bulbs in the dark on the road again.


So what LED headlight did you get?


The Lumotech IQ Cyo R Plus, which is supposed to actually be
a little less bright than the similar IQ Cyo Plus. Both have
a stand light built in.

I've got it matched to a Busch&Müller DToplight XS Plus tail
light. It also has a stand light built in and is quite bright.
Both lights are driven by a 6V Dymotec bottle generator.

A bit pricey for sure, but I now think I've got a near permanent
solution to night riding. Feel real good about the purchases
despite the cost.

Check out the lighting offerings mentioned at Peter White's
http://www.peterwhitecycles.com/dymotec.asp


SMH
Ads
  #42  
Old December 10th 09, 05:00 AM posted to rec.bicycles.misc,rec.bicycles.tech,sci.physics,sci.chem
Ron Peterson
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Posts: 11
Default "white" LED's vs. incandescent and halogen lights

On Dec 5, 9:19 am, "Androcles" wrote:

The latest fireflies from Nature now produce more than a million times the
amount
of light that a compact LED produces for even less electrical power.


White LEDs can have an efficiency of 22% currently compared to a
maximum possible efficiency for white light of 37%, fireflies are only
96% efficient.

--
Ron

  #43  
Old December 10th 09, 06:01 AM posted to rec.bicycles.misc,rec.bicycles.tech,sci.physics,sci.chem
Androcles[_4_]
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Posts: 17
Default "white" LED's vs. incandescent and halogen lights


"Ron Peterson" wrote in message
...
On Dec 5, 9:19 am, "Androcles" wrote:

The latest fireflies from Nature now produce more than a million times
the
amount
of light that a compact LED produces for even less electrical power.


White LEDs can have an efficiency of 22% currently compared to a
maximum possible efficiency for white light of 37%, fireflies are only
96% efficient.


They'd better change their Duracells over to Energizer Bunny cells, then.



  #44  
Old December 10th 09, 06:48 AM posted to rec.bicycles.misc,rec.bicycles.tech,sci.physics,sci.chem
Dirk Bruere at NeoPax
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Posts: 5
Default "white" LED's vs. incandescent and halogen lights

Ron Peterson wrote:
On Dec 5, 9:19 am, "Androcles" wrote:

The latest fireflies from Nature now produce more than a million times the
amount
of light that a compact LED produces for even less electrical power.


White LEDs can have an efficiency of 22% currently compared to a
maximum possible efficiency for white light of 37%, fireflies are only
96% efficient.


Latest record is around 190 lm/W
http://en.wikipedia.org/wiki/Luminous_efficacy

--
Dirk

http://www.transcendence.me.uk/ - Transcendence UK
http://www.theconsensus.org/ - A UK political party
http://www.blogtalkradio.com/onetribe - Occult Talk Show
  #45  
Old December 10th 09, 06:55 AM posted to rec.bicycles.misc,rec.bicycles.tech,sci.physics,sci.chem
Androcles[_4_]
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Posts: 17
Default "white" LED's vs. incandescent and halogen lights


"Dirk Bruere at NeoPax" wrote in message
...
Ron Peterson wrote:
On Dec 5, 9:19 am, "Androcles" wrote:

The latest fireflies from Nature now produce more than a million times
the
amount
of light that a compact LED produces for even less electrical power.


White LEDs can have an efficiency of 22% currently compared to a
maximum possible efficiency for white light of 37%, fireflies are only
96% efficient.


Latest record is around 190 lm/W
http://en.wikipedia.org/wiki/Luminous_efficacy

--
Dirk


How many watts does a firefly use, then?





  #46  
Old December 10th 09, 08:37 AM posted to rec.bicycles.misc,rec.bicycles.tech,sci.physics,sci.chem
Dirk Bruere at NeoPax
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Posts: 5
Default "white" LED's vs. incandescent and halogen lights

Androcles wrote:
"Dirk Bruere at NeoPax" wrote in message
...
Ron Peterson wrote:
On Dec 5, 9:19 am, "Androcles" wrote:

The latest fireflies from Nature now produce more than a million times
the
amount
of light that a compact LED produces for even less electrical power.
White LEDs can have an efficiency of 22% currently compared to a
maximum possible efficiency for white light of 37%, fireflies are only
96% efficient.

Latest record is around 190 lm/W
http://en.wikipedia.org/wiki/Luminous_efficacy

--
Dirk


How many watts does a firefly use, then?


No idea, but it is far higher efficiency than any current LED

--
Dirk

http://www.transcendence.me.uk/ - Transcendence UK
http://www.theconsensus.org/ - A UK political party
http://www.blogtalkradio.com/onetribe - Occult Talk Show
  #47  
Old December 10th 09, 02:15 PM posted to rec.bicycles.misc,rec.bicycles.tech,sci.physics,sci.chem
Androcles[_4_]
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Posts: 17
Default "white" LED's vs. incandescent and halogen lights


"Dirk Bruere at NeoPax" wrote in message
...
Androcles wrote:
"Dirk Bruere at NeoPax" wrote in message
...
Ron Peterson wrote:
On Dec 5, 9:19 am, "Androcles" wrote:

The latest fireflies from Nature now produce more than a million times
the
amount
of light that a compact LED produces for even less electrical power.
White LEDs can have an efficiency of 22% currently compared to a
maximum possible efficiency for white light of 37%, fireflies are only
96% efficient.
Latest record is around 190 lm/W
http://en.wikipedia.org/wiki/Luminous_efficacy

--
Dirk


How many watts does a firefly use, then?


No idea, but it is far higher efficiency than any current LED

Yeah, I figured it was much higher than 96% too. Pity you have no
idea what "none" is.



  #48  
Old December 10th 09, 05:15 PM posted to rec.bicycles.misc,rec.bicycles.tech,sci.physics,sci.chem
Peter Cole[_2_]
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Posts: 4,572
Default "white" LED's vs. incandescent and halogen lights

Ron Peterson wrote:
On Dec 5, 9:19 am, "Androcles" wrote:

The latest fireflies from Nature now produce more than a million times the
amount
of light that a compact LED produces for even less electrical power.


White LEDs can have an efficiency of 22% currently compared to a
maximum possible efficiency for white light of 37%, fireflies are only
96% efficient.

--
Ron


According to this:
http://www.nature.com/nphoton/journa....2007.251.html

and this:
http://www.bioluminescentbeetles.com/introduction.html

New measurements put quantum efficiency of firefly bioluminescence at 41
+/- 7.4%.

"Initially predicted to be around 88% efficient the firefly
bioluminescent quantum yield has recently been accurately identified to
be 41.0 ± 7.4% which is still higher than those found in other forms of
bioluminescence, i.e. aequorin (17%), cypridina (28%) and bacteria (30%)
[4]."
  #49  
Old December 11th 09, 05:24 PM posted to rec.bicycles.misc,uk.rec.cycling,rec.bicycles.tech,sci.physics,sci.chem
me[_7_]
external usenet poster
 
Posts: 13
Default "white" LED's vs. incandescent and halogen lights

On Dec 7, 1:30*am, Peter Clinch wrote:

me wrote:
It's obvious that the mundane "white" LED bicycle lights do not light
up the asphalt roads very well. *Incandescents, halogens, and sodium
lights do better.


Oh. *Last week I had the chance to compare a well respected halogen lamp
(BuM Lumotec Oval) to a well respected LED lamp (BuM IQ Fly) on the same
(unlit, asphalt) road at the same time, both running from dynoubs on
side by side bikes, and the IQ Fly did a damn site better job of
lighting it up.

So obvious to some, perhaps, but not me.

Pete.
--


ok,

So it looks like I'll have to to some unbiased testing. It will take
a while. Lifestyle hardships get in the way. Just a homeless bum,
you know.

There are issues involving

1. Spectral distribution from the emitting sources of light
2. Spectral reflectance from whatever the light hits
3. Reflective intensity of the individual colors
4. Spectral perception of the individual
5. Calibration of the reflected colors from a camera device and the
display device
6. Mathematical dealings with superposition issues

I have the 'digital color utility' on my aging mac and an older
digital camcorder that I use for stills. I don't have a high quality
LED lamp which costs too much for me to buy so maybe I'll be able to
borrow one to test. I have an ancient 35mm camera with a light meter
that I will have to calibrate and buy a battery for. I'll have to buy
a few LED's and potentiometers from a parts store. I'll try to mount
them on a dissected cateye opticube. I'll use my cheap digital
voltmeter to get the relation between power and illumination. I have
a diffraction grating that might reveal something. I'll mount it on a
toilet paper roll with a slit on the other end, and attach it to the
camera. I'll use my set of oil crayons for color reference that I
previously used to make a panhandling sign.

I figure I'll eventually shoot around 50 still pix. I might add a set
of fluorescent light pix. I suppose I'll web it up eventually.

errata -

1. many asphalt streets I've seen have varying amounts of small
exposed stones (limestone?) embedded on the surface that will reflect
yellows better than blues. Trees and foliage have a lot of yellow
reflectance.

2. Older people may experience yellowing of the lens in their eyes,
causing less sensitivity to blues. Recently I recommended a 2 front-
light setup for a 60-something biker - one small blue-light flasher,
and a larger halogen with adjustable focus mounted on a flashlight
holder. If you use the halogen only occasionally, the batteries
should last a long time
  #50  
Old December 11th 09, 07:17 PM posted to rec.bicycles.misc,uk.rec.cycling,rec.bicycles.tech,sci.physics,sci.chem
thirty-six
external usenet poster
 
Posts: 10,049
Default "white" LED's vs. incandescent and halogen lights

On 11 Dec, 16:24, me wrote:
On Dec 7, 1:30*am, Peter Clinch wrote:

me wrote:
It's obvious that the mundane "white" LED bicycle lights do not light
up the asphalt roads very well. *Incandescents, halogens, and sodium
lights do better.


Oh. *Last week I had the chance to compare a well respected halogen lamp
(BuM Lumotec Oval) to a well respected LED lamp (BuM IQ Fly) on the same
(unlit, asphalt) road at the same time, both running from dynoubs on
side by side bikes, and the IQ Fly did a damn site better job of
lighting it up.


So obvious to some, perhaps, but not me.


Pete.
--


ok,

So it looks like I'll have to to some unbiased testing. *It will take
a while. *Lifestyle hardships get in the way. *Just a homeless bum,
you know.

There are issues involving

1. *Spectral distribution from the emitting sources of light
2. *Spectral reflectance from whatever the light hits
3. *Reflective intensity of the individual colors
4. *Spectral perception of the individual
5. *Calibration of the reflected colors from a camera device and the
display device
6. *Mathematical dealings with superposition issues

I have the 'digital color utility' on my aging mac and an older
digital camcorder that I use for stills. *I don't have a high quality
LED lamp which costs too much for me to buy so maybe I'll be able to
borrow one to test. *I have an ancient 35mm camera with a light meter
that I will have to calibrate and buy a battery for. *I'll have to buy
a few LED's and potentiometers from a parts store. *I'll try to mount
them on a dissected cateye opticube. *I'll use my cheap digital
voltmeter to get the relation between power and illumination. *I have
a diffraction grating that might reveal something. *I'll mount it on a
toilet paper roll with a slit on the other end, and attach it to the
camera. *I'll use my set of oil crayons for color reference that I
previously used to make a panhandling sign.

I figure I'll eventually shoot around 50 still pix. *I might add a set
of fluorescent light pix. *I suppose I'll web it up eventually.

errata -

1. *many asphalt streets I've seen have varying amounts of small
exposed stones (limestone?) embedded on the surface that will reflect
yellows better than blues. *Trees and foliage have a lot of yellow
reflectance.

2. *Older people may experience yellowing of the lens in their eyes,
causing less sensitivity to blues. *Recently I recommended a 2 front-
light setup for a 60-something biker - one small blue-light flasher,
and a larger halogen with adjustable focus mounted on a flashlight
holder. *If you use the halogen only occasionally, the batteries
should last a long time


You'll also want a reference grey card (shirt card) and a tape
measure..
 




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