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Rear LED light effectiveness.



 
 
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  #41  
Old March 15th 06, 02:29 PM posted to uk.rec.cycling
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Default Rear LED light effectiveness.

In article , Simon Bennett
) wrote:
Dave Larrington wrote:

I /did/ get passed by a semi-visible Richard Phipps about 160 km into
the South Bucks Winter Warmer, but some new flatteries at the next
control sorted that out...


Do his clones ever ride on the same Audaxes? Might explain the subtle
differences.

I saw one on the Invicta Hilly on Sunday.


I think I saw two on the Kennett Valley Run.

--
Dave Larrington - http://www.legslarry.beerdrinkers.co.uk/
All your call centre are belong to us.
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  #42  
Old March 15th 06, 02:32 PM posted to uk.rec.cycling
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Default Rear LED light effectiveness.

MartinM wrote:

did you see his saddle bag? it looked a bit small, I assume that's a
Super C


A bit small for what? I didn't see it, but I know how big they are.


  #43  
Old March 15th 06, 02:34 PM posted to uk.rec.cycling
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Default Rear LED light effectiveness.

MartinM wrote:

did you see his saddle bag? it looked a bit small, I assume that's a
Super C


Did it look like this?
http://www.wallbike.com/carradice/supercsaddlepack.html


  #44  
Old March 15th 06, 03:39 PM posted to uk.rec.cycling
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Default Rear LED light effectiveness.


Simon Bennett wrote:
MartinM wrote:

did you see his saddle bag? it looked a bit small, I assume that's a
Super C


Did it look like this?
http://www.wallbike.com/carradice/supercsaddlepack.html


not quite it had mesh side pockets but about the same size; I prefer my
SQR tour but it is a lot bigger (although still very light)

  #45  
Old March 15th 06, 03:47 PM posted to uk.rec.cycling
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Default Rear LED light effectiveness.

MartinM wrote:
Simon Bennett wrote:
MartinM wrote:

did you see his saddle bag? it looked a bit small, I assume that's a
Super C


Did it look like this?
http://www.wallbike.com/carradice/supercsaddlepack.html


not quite it had mesh side pockets but about the same size;


Yes, that's the one. Can't see the pockets in the pic.

I prefer
my SQR tour but it is a lot bigger (although still very light)


You wait until it's packed full -- it'll throw you off your bike I tells ya!


  #46  
Old March 15th 06, 07:27 PM posted to uk.rec.cycling
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Default Rear LED light effectiveness.

On Wed, 15 Mar 2006 08:18 +0000 (GMT Standard Time),
(Terry) wrote:

Ah, so you know the street I'm referring to, and are thus aware that it is
a narrow rat-run with poor lighting, road-humps, cars parked on both
sides, and cars entering and crossing having limited visibility due to
parked cars?

I'm so very glad that neither you nor the dick risking his kid's life is
my dad.


May I suggest you don't take a trip to China. From the sound of it
your heart would pack up in 0.0001 seconds if you saw the way people
cycled at night in some of the cities I have visited. Sanya struck me
as being particularly bad - but perhaps that's only because it's the
only Chinese city (apart from Bejing) where I have cycled.

I didn't see a single bicycle light being used and the only helmets I
saw were worn by construction workers cycling to work. Perhaps it's
just as well the one child per family policy is still enforced in the
city (with an exception for a couple, both the product of the one
child policy). I'd hate it for you to see a family of five on one
bike, cycling at night in an unlit street covered in potholes.
--
Let us have a moment of silence for all Americans who
are now stuck in traffic on their way to a health club
to ride a stationary bicycle. -
Congressman Earl Blumenauer (Oregon)
  #47  
Old March 15th 06, 07:38 PM posted to uk.rec.cycling
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Default Rear LED light effectiveness.

In article 441809da.0@entanet, Zog The Undeniable wrote:
Pete Biggs wrote:
Zog The Undeniable wrote:

LEDs are also generally awful when run from NiMH cells.


"Nickel Metal-Hydride batteries have a high capacity and a very flat
discharge curve which maintains a cell voltage of 1.2V over ~80% of the
discharge curve. This gives a nominal pack voltage of 4.8V which as you
can see from the graph brings the mean efficiency up toward 70% and since
the fully charged voltage of the pack is only 5.6V the maximum LED power
is about 1.3W for a brief period and stays at 1W for most of the discharge
cycle. If you do not want to modify the light I strongly recommend you use
NiMH rechargeable batteries, you will get much longer run times."
- http://www.ajjrice.plus.com/reviews/smart%20nova.htm


Yes, but LEDs are more voltage dependent than current dependent.


Well, sort of, in a way, ignoring lights with proper regulation (which
should be current regulation for LEDs, not voltage regulation).

But while the lower internal resistance of rechargables isn't as
significant at the typically lower current requirements of LED lights
compared with incandescents, LEDs are more efficient at lower currents,
so a small amount of undervolting won't reduce brightness anything like
as much as it would for an incandescent.

Any LED light that is ok on part-used alkalines should be fine with NiMH.
  #49  
Old March 15th 06, 08:05 PM posted to uk.rec.cycling
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Default Rear LED light effectiveness.

In article , (Tony
Raven) wrote:

Terry wrote:
In article ,

(Tony Raven) wrote:

Terry wrote:
I was horrified by the bloke cycling without lights in London the
other night while carrying his young daughter on the crossbar. It

was a cold night as well and the poor kid had no gloves.

Although I use lights in London to be honest they are not critical
unless it is raining. Street lighting is very good and visibility

of cyclists is not a problem in general.

Ah, so you know the street I'm referring to, and are thus aware that
it is a narrow rat-run with poor lighting, road-humps, cars parked on
both sides, and cars entering and crossing having limited visibility
due to parked cars? I'm so very glad that neither you nor the
dick risking his kid's life is my dad.



Which part of "in general" did you not understand?


Given that you wrote it, which part of "they are not critical unless it is
raining" did /you/ not understand.

I didn't make a general point. I made a specific point about a specific
incident in which a specific person did a very foolish thing in a specific
location which caused it also to be very dangerous. Had it been two lads
larking about I wouldn't have mentioned it, but a small child is entitled
to expect better, both of its carers and of other adults who might, for
whatever reason, choose to gloss over criminal stupidity with glib
generalisations.


 




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