SIX thousand and FIVE hundred lumens !!!!!!!!!!

Jeff Liebermann wrote:

Nice. There's another difference. He had
years of experience, while you seem to be
limiting yourself to what you can learn from
a garage full of old bicycles and parts.

Is it that obvious? *blushes*

But actually, I work every night several hours
to elevate my game and take it to the next
level! I'll post a couple of photos tomorrow,
God willing.

That works, to a point, but I think you will
do much better either working for someone
else in order to learn the trade

That'd be nice but

1) there is absolutely no money in this;

2) I love to work at night, I'm an owl from my
programming days, I peak at ~03:00/3:00 AM;

3) tho I love bikes, I love to repair one per
day or so, not 10 or God knows how many they
do in an 8h work day; and

4) I'm a perfectionist. When I repair a bike,
I aim for 100% perfection. And sometimes
I get close! What I don't care for is when
people come with a dirty bike, with the hand
brake broke, the saddle has a hole in it,
but they only want to have the flat tire
fixed. Then I say, "I'll fix your ENTIRE
bike, OK?" Sometimes they accept this and
are very pleased by the result - without
boasting - but most often they take it to
a professional shop which is fine by me.

So no, I'm not going pro on this, ever.

or working on a better class of bicycle.

Now I have two such bikes myself, one
Scott Scale 960 alu-MTB, one
Merckx emx-1 carbon racer, so I have some
understanding.

But people who own such bikes don't come to the
organization and for help. They have money.
Unless they are bums and the stuff is stolen.

--
underground experts united
http://user.it.uu.se/~embe8573

On 10/8/2018 12:24 PM, Jeff Liebermann wrote:

snip

Anyway, I would be quite satisfied if Emanuel Berg were to build
something resembling a bicycle light from scratch, measures the
lumens, lux, candelas, beam pattern, variation in intensity across the
beam pattern, power draw, operating temperature, and then improves the
design updating the measurements as he makes changes.

What are really nice for a homebrew system are the MR16 LED lamps
because they have an integrated thermal solution and are available in
many different beam patterns. The beam pattern of a two lamp MR16 system
is close to ideal, with sufficient spread to illuminate street signs,
while not blinding on coming traffic.

There used to be commercially available MR11 and MR16 dual beam systems
but there was overhead involved in using those lamps which made them
larger and heavier than what can be achieved now. They also require too
many cells to achieve the proper voltage. You can run them with 3 or 4
Li-Ion cells in series for 11.1V or 14.8V.

On Mon, 08 Oct 2018 11:06:53 -0700, Joerg
wrote:

On 2018-10-07 17:08, John B. Slocomb wrote:
On Sun, 7 Oct 2018 15:02:19 -0400, Frank Krygowski
wrote:

On 10/6/2018 2:49 PM, Joerg wrote:

[...]


2. It causes oncoming motorists to see the cyclist much earlier and, for
example, if a big semi comes they can pull a bit to the right so the
semi can give the cyclist wide berth.

I do NOT believe any practical light allows a motorist to see a cyclist
_much_ earlier. In almost every case, I've seen on-road cyclists before
I noticed that they had a light. And in no case did I see the light
early enough to make any practical difference. You're fixating on a
superstitious talisman, imagining benefits that don't exist in real life.


I think I've mentioned seeing the bloke on a bike wearing bright
orange knee socks nearly a kilometer away :-) I remember the orange
socks but can't remember whether he had a light on his bike or not :-)


I wonder what the reaction would be if said bloke participated in a
business meeting wearing bright orange knee socks.

The subject was bicycle visibility, not business meetings.... but
having said that I might comment that it is not difficult to change
socks, even sitting on the roadside curb.
--
Cheers

John B.

On 2018-10-08 16:05, John B. Slocomb wrote:
On Mon, 08 Oct 2018 11:06:53 -0700, Joerg
wrote:

On 2018-10-07 17:08, John B. Slocomb wrote:
On Sun, 7 Oct 2018 15:02:19 -0400, Frank Krygowski
wrote:

On 10/6/2018 2:49 PM, Joerg wrote:

[...]


2. It causes oncoming motorists to see the cyclist much earlier and, for
example, if a big semi comes they can pull a bit to the right so the
semi can give the cyclist wide berth.

I do NOT believe any practical light allows a motorist to see a cyclist
_much_ earlier. In almost every case, I've seen on-road cyclists before
I noticed that they had a light. And in no case did I see the light
early enough to make any practical difference. You're fixating on a
superstitious talisman, imagining benefits that don't exist in real life.


I think I've mentioned seeing the bloke on a bike wearing bright
orange knee socks nearly a kilometer away :-) I remember the orange
socks but can't remember whether he had a light on his bike or not :-)


I wonder what the reaction would be if said bloke participated in a
business meeting wearing bright orange knee socks.

The subject was bicycle visibility, not business meetings....


To me a bicycle is not just a piece of sports equipment but foremost a
transport vehicle.


... but
having said that I might comment that it is not difficult to change
socks, even sitting on the roadside curb.


And change all the other things sitting on a curb in a business park? I
rather flick a little switch and have instant visibility. Upon arrival I
flick it again, visibility turns off. Simple.

--
Regards, Joerg

http://www.analogconsultants.com/

On Monday, October 8, 2018 at 4:16:43 PM UTC-7, Joerg wrote:
On 2018-10-08 16:05, John B. Slocomb wrote:
On Mon, 08 Oct 2018 11:06:53 -0700, Joerg
wrote:

On 2018-10-07 17:08, John B. Slocomb wrote:
On Sun, 7 Oct 2018 15:02:19 -0400, Frank Krygowski
wrote:

On 10/6/2018 2:49 PM, Joerg wrote:

[...]


2. It causes oncoming motorists to see the cyclist much earlier and, for
example, if a big semi comes they can pull a bit to the right so the
semi can give the cyclist wide berth.

I do NOT believe any practical light allows a motorist to see a cyclist
_much_ earlier. In almost every case, I've seen on-road cyclists before
I noticed that they had a light. And in no case did I see the light
early enough to make any practical difference. You're fixating on a
superstitious talisman, imagining benefits that don't exist in real life.


I think I've mentioned seeing the bloke on a bike wearing bright
orange knee socks nearly a kilometer away :-) I remember the orange
socks but can't remember whether he had a light on his bike or not :-)


I wonder what the reaction would be if said bloke participated in a
business meeting wearing bright orange knee socks.

The subject was bicycle visibility, not business meetings....


To me a bicycle is not just a piece of sports equipment but foremost a
transport vehicle.

Wow, that's poignant. I've been commuting to school or work for 50 years and changing my clothes for the last 40. Even when I was a substitute teacher, I would ride to school with a backpack and change when I got there. There is always some place to change. I certainly wouldn't go to a client meeting in rain drenched or sweat drenched shirt -- or in shorts. Do you go to client meetings in t-shirts and shorts?



... but
having said that I might comment that it is not difficult to change
socks, even sitting on the roadside curb.


And change all the other things sitting on a curb in a business park? I
rather flick a little switch and have instant visibility. Upon arrival I
flick it again, visibility turns off. Simple.

Do you have a side light? I'd worry about that. Pull though an intersection and "whack." Where was your side light! You really should have a bright side light.

-- Jay Beattie.

On Mon, 08 Oct 2018 16:16:43 -0700, Joerg
wrote:

On 2018-10-08 16:05, John B. Slocomb wrote:
On Mon, 08 Oct 2018 11:06:53 -0700, Joerg
wrote:

On 2018-10-07 17:08, John B. Slocomb wrote:
On Sun, 7 Oct 2018 15:02:19 -0400, Frank Krygowski
wrote:

On 10/6/2018 2:49 PM, Joerg wrote:

[...]


2. It causes oncoming motorists to see the cyclist much earlier and, for
example, if a big semi comes they can pull a bit to the right so the
semi can give the cyclist wide berth.

I do NOT believe any practical light allows a motorist to see a cyclist
_much_ earlier. In almost every case, I've seen on-road cyclists before
I noticed that they had a light. And in no case did I see the light
early enough to make any practical difference. You're fixating on a
superstitious talisman, imagining benefits that don't exist in real life.


I think I've mentioned seeing the bloke on a bike wearing bright
orange knee socks nearly a kilometer away :-) I remember the orange
socks but can't remember whether he had a light on his bike or not :-)


I wonder what the reaction would be if said bloke participated in a
business meeting wearing bright orange knee socks.

The subject was bicycle visibility, not business meetings....


To me a bicycle is not just a piece of sports equipment but foremost a
transport vehicle.


... but
having said that I might comment that it is not difficult to change
socks, even sitting on the roadside curb.


And change all the other things sitting on a curb in a business park? I
rather flick a little switch and have instant visibility. Upon arrival I
flick it again, visibility turns off. Simple.

As I said, I noticed the orange socks going up and down a kilometer
away on a bright summer day. I doubt strongly whether your super-duper
light would even be visible (in bright daylight) at that distance.
--
Cheers

John B.

On Mon, 8 Oct 2018 16:55:59 -0700 (PDT), jbeattie
wrote:

On Monday, October 8, 2018 at 4:16:43 PM UTC-7, Joerg wrote:
On 2018-10-08 16:05, John B. Slocomb wrote:
On Mon, 08 Oct 2018 11:06:53 -0700, Joerg
wrote:

On 2018-10-07 17:08, John B. Slocomb wrote:
On Sun, 7 Oct 2018 15:02:19 -0400, Frank Krygowski
wrote:

On 10/6/2018 2:49 PM, Joerg wrote:

[...]


2. It causes oncoming motorists to see the cyclist much earlier and, for
example, if a big semi comes they can pull a bit to the right so the
semi can give the cyclist wide berth.

I do NOT believe any practical light allows a motorist to see a cyclist
_much_ earlier. In almost every case, I've seen on-road cyclists before
I noticed that they had a light. And in no case did I see the light
early enough to make any practical difference. You're fixating on a
superstitious talisman, imagining benefits that don't exist in real life.


I think I've mentioned seeing the bloke on a bike wearing bright
orange knee socks nearly a kilometer away :-) I remember the orange
socks but can't remember whether he had a light on his bike or not :-)


I wonder what the reaction would be if said bloke participated in a
business meeting wearing bright orange knee socks.

The subject was bicycle visibility, not business meetings....


To me a bicycle is not just a piece of sports equipment but foremost a
transport vehicle.

Wow, that's poignant. I've been commuting to school or work for 50 years and changing my clothes for the last 40. Even when I was a substitute teacher, I would ride to school with a backpack and change when I got there. There is always some place to change. I certainly wouldn't go to a client meeting in rain drenched or sweat drenched shirt -- or in shorts. Do you go to client meetings in t-shirts and shorts?




... but
having said that I might comment that it is not difficult to change
socks, even sitting on the roadside curb.


And change all the other things sitting on a curb in a business park? I
rather flick a little switch and have instant visibility. Upon arrival I
flick it again, visibility turns off. Simple.

Do you have a side light? I'd worry about that. Pull though an intersection and "whack." Where was your side light! You really should have a bright side light.

-- Jay Beattie.

There is also a great danger from large birds. One really should have
an upward shining helmet lamp. I'm a bit ambivalent about snakes, my
present thoughts that one is probably safe from snake bite in a
metropolitan neighborhood.
--
Cheers

John B.

On 10/7/2018 8:36 PM, jbeattie wrote:

Pah-lease! No homicidal riff-raff was wearing my super-fine, hi-viz, four-way stretch water resistant, race fit Castelli Gabba jacket...

OT, but: The term "four-way stretch" has always irritated me. The stuff
is two dimensional! Are they claiming it also stretches across its
thickness? Plus there are only three spatial dimensions. Are they going
Einsteinian and claiming the fourth direction is time?

So I looked it up. Turns out if it stretches from left to right, they
consider that "two-way stretch." Was that supposed to be a big
improvement on fabrics that stretched if you pulled them to the right,
but not if you pulled to the left? No, it was clearly just one way - but
they said that since it returned to its original width when you let go,
it counted as two ways. If it does it up and down and side to side, they
count it as four ways. What nonsense!

I guess I should be glad rope manufacturers don't take this up. "Our
working strength is _twice_ as great as our competitors! (Because our
rope can withstand that force if you pull up OR pull down!)"

--
- Frank Krygowski

On 10/7/2018 11:37 PM, sms wrote:

A long time ago, one poster here was insisting that one reason LED
lights were so wonderful was the lack of a "white-hot filament."

Nothing like resurrecting an old debate, but rephrasing it in your own
straw-man terms, Scharf.

--
- Frank Krygowski

On 10/8/2018 7:55 PM, jbeattie wrote:
On Monday, October 8, 2018 at 4:16:43 PM UTC-7, Joerg wrote:
On 2018-10-08 16:05, John B. Slocomb wrote:
On Mon, 08 Oct 2018 11:06:53 -0700, Joerg
wrote:

On 2018-10-07 17:08, John B. Slocomb wrote:
On Sun, 7 Oct 2018 15:02:19 -0400, Frank Krygowski
wrote:

On 10/6/2018 2:49 PM, Joerg wrote:

[...]


2. It causes oncoming motorists to see the cyclist much earlier and, for
example, if a big semi comes they can pull a bit to the right so the
semi can give the cyclist wide berth.

I do NOT believe any practical light allows a motorist to see a cyclist
_much_ earlier. In almost every case, I've seen on-road cyclists before
I noticed that they had a light. And in no case did I see the light
early enough to make any practical difference. You're fixating on a
superstitious talisman, imagining benefits that don't exist in real life.


I think I've mentioned seeing the bloke on a bike wearing bright
orange knee socks nearly a kilometer away :-) I remember the orange
socks but can't remember whether he had a light on his bike or not :-)


I wonder what the reaction would be if said bloke participated in a
business meeting wearing bright orange knee socks.

The subject was bicycle visibility, not business meetings....


To me a bicycle is not just a piece of sports equipment but foremost a
transport vehicle.

Wow, that's poignant. I've been commuting to school or work for 50 years and changing my clothes for the last 40. Even when I was a substitute teacher, I would ride to school with a backpack and change when I got there. There is always some place to change. I certainly wouldn't go to a client meeting in rain drenched or sweat drenched shirt -- or in shorts. Do you go to client meetings in t-shirts and shorts?

I bike commuted for over 30 years (admittedly, not every day) wearing
the same business casual clothes I wore during the work day. I wasn't
super-fast, but the seven mile trip between home and the last job took
me less than half an hour, traffic lights and all. I took it easy on the
(downhill) way to work, and usually time trialed on the way home. My
clothes were sweaty when I got home, but they could go in the laundry.

--
- Frank Krygowski