Let a Candle Light Thy Way.

Those old kerosene lanterns (of which I own a bunch of them) just might
be back in vogue someday.
Anybody want to buy an old kerosene lantern?
cuhulin

http://www.devilfinder.com
Jackson,Mississippi Observatory

Observa DOME? I had never hoid of that one before.

Wreak of the Mary Deare movie is crankin up on the TCM channel right
now.It is hot and muggy and humid outside.Doggy and I are goin tu watch
teh movie.
cuhulin

bpnjensen wrote:
On Jun 12, 5:08 am, wrote:
bpnjensen wrote:
On Jun 11, 1:40 pm, Bob wrote:
bpnjensen wrote:

Metal Halide lamps, especially unshielded, are the pits. Brilliant,
sky-obscuring, and hard to overcome with normal amateur filter
equipment.

I remember MHs as having a discontinuous spectrum
with about five distinct resonance points
so you would have to combine filtration,
unlike the monochromatic LPS lights.
They probably have some IR and UV too
but I only looked at the visible range in my spectrographic device.

--

Operator Bob
Echo Charlie 42

Thanks for this, Bob. We have filters that can filter out more than
one wavelength, and we can stack filters up to a point - but none that
will cut all five of the spikes, and too many stacked means you also
lose precious desirable light. We also have broader band filters
designed to cut general LP that would probably address all five, but
these filters are also weaker than the stronger line filters. You are
right about LPS, it's a snap to filter - which is why it's been
encouraged for cities near major observatories, such as Lick, Mt.
Wilson (now pretty much useless) and Palomar.

Of course, just as in radio an RF quiet area is best, so in astronomy
nothing beats a good rural or wilderness *dark* sky.

Bruce Jensen
California

As Wilson is primarily a solar observatory these days, I doubt the gas
mixture in the street lamps is very important. I am 18 miles NNW of
Wilson at 1,790', and I can see the Milky Way from my back yard.

That's why it's primarily a solar observatory - the LP from LA has
rendered it useless for dark sky astro. 18 miles can make a big
difference...but it takes a REALLY dark sky for the Milky Way to throw
shadows...

It was really bright when I was in BSA.

On Jun 11, 8:29*am, wrote:
LED traffic lights and LED sidewalk lights don't put out any heat to
melt the ice and snow in the Wintertime.There were problems with that
last Winter, especially with traffic lights.Sooooo, if they have to wind
up rigging up some way to keep the ice and snow from obscuring those LED
lights, where is the energy savings? Last Winter, in some parts of
America, they had trucks going around and spraying deicing
fluid/whatever kind of fluid on some LED traffic lights.Not much savings
(Money) there either.
cuhulin

Many of these so-called 10 Year "Last-4-Ever"
{low maintenance} 10 Year LED Traffic Light Bulbs
are now showing individual LED and complete
segments of LEDs that are not working and the
Light coming from the Traffic Light is dim at best.

The technology still needs work to be truly cost
effective and durable for normal consumer use
and oh yes Bright Enough To Read By ! ~ RHF

bpnjensen wrote:
On Jun 12, 5:08 am, wrote:


As Wilson is primarily a solar observatory these days, I doubt the gas
mixture in the street lamps is very important. I am 18 miles NNW of
Wilson at 1,790', and I can see the Milky Way from my back yard.

That's why it's primarily a solar observatory - the LP from LA has
rendered it useless for dark sky astro. 18 miles can make a big
difference...but it takes a REALLY dark sky for the Milky Way to throw
shadows...

As I recall from some hideous PBS in a hotel room, the 100" [?] was too
tiny for anything else, according to the guy who built the 200" on
Palomar. I'm way too busy to look it up.

On Jun 12, 7:10*am, Bill Baka wrote:
On 06/11/2010 08:14 AM, bpnjensen wrote:

On Jun 11, 6:42 am, *wrote:
wrote:
Them bulbs, them bulbs, them dryyy bulbs, doooooo the work of the
Lawd,,,,

And there was Light.
What will Ford Motor Company (Ford has a better Idea, CLICK!) do if
Incandescent Light Bulbs are outlawed in America?
cuhulin

Incandescent panel lamps will still be allowed for a while at least
won't they?

*Something* with a dimmer switch. Runs on a battery anyway...

Uh, Guys,
The amount of electricity taken by the headlamps is totally
insignificant compared to the power to move the car, so I don't think it
is a priority with any car maker. They have almost all gone to LED tail
lights and turn signals since they don't burn out nearly as often, it at
all, and they can claim to be going high tech. Headlamps I have seen a
lot of halogen but when a car is coming at me it is damn near blinding
even on low beam.
There's up and then there's downs to any technology.
Lets hope the LED's when they finally make it to headlights can have a
better focused beam.
Bill Baka

The big saving to the Auto Makers is that the
new LED Lights can use a smaller Wire and
help reduce the Cost and Weight of the Car.
{= Improved Fuel Economy} ~ RHF

Brenda Ann wrote:

"dxAce" wrote in message
...

Might it be really dark when Arizona cuts off the juice?

dxAce
Michigan
USA

The mere threat of doing so could actually get AZ in a buttload of trouble
with the feds. Along with being illegal (extortion), it's also a threat to
national security and an act of terrorism under the Patriot Act. But then,
AZ doesn't seem to care what anyone thinks.

Threat to national security? Come on. Arizona is merely trying to enhance
national security.

Something that Boy Barry and his cadre of Liberal/Democrat/Marxist/Socialists
seem to care little about.

Buy Arizona. Support Freedom.

dxAce
Michigan
USA

RHF wrote:
On Jun 11, 8:29 am, wrote:
LED traffic lights and LED sidewalk lights don't put out any heat to
melt the ice and snow in the Wintertime.There were problems with that
last Winter, especially with traffic lights.Sooooo, if they have to wind
up rigging up some way to keep the ice and snow from obscuring those LED
lights, where is the energy savings? Last Winter, in some parts of
America, they had trucks going around and spraying deicing
fluid/whatever kind of fluid on some LED traffic lights.Not much savings
(Money) there either.
cuhulin

Many of these so-called 10 Year "Last-4-Ever"
{low maintenance} 10 Year LED Traffic Light Bulbs
are now showing individual LED and complete
segments of LEDs that are not working and the
Light coming from the Traffic Light is dim at best.

The technology still needs work to be truly cost
effective and durable for normal consumer use
and oh yes Bright Enough To Read By ! ~ RHF
.
?? They've been using LEDS forever. What I'd do in the frozen North,
is use LEDS for Red and Yellow, and incandescent for Green. A standard
4 sided fixture would almost continuously produce 240 Watts of heat,
enough to keep ice from forming, no?

dxAce wrote:

Brenda Ann wrote:

"dxAce" wrote in message
...

Might it be really dark when Arizona cuts off the juice?

dxAce
Michigan
USA

The mere threat of doing so could actually get AZ in a buttload of trouble
with the feds. Along with being illegal (extortion), it's also a threat to
national security and an act of terrorism under the Patriot Act. But then,
AZ doesn't seem to care what anyone thinks.

Threat to national security? Come on. Arizona is merely trying to enhance
national security.

Something that Boy Barry and his cadre of Liberal/Democrat/Marxist/Socialists
seem to care little about.

Buy Arizona. Support Freedom.

One other item: Just how did Boy Barry's Aunt obtain 'asylum' under our nations
immigration laws?

What 'threat' was she under in Kenya?

If she was under some 'threat', then why were Boy Barry's other relatives not
airlifted out of Kenya?

Why were Boy Barry's Aunt's immigration papers, and the reason for her 'asylum'
sealed?

dxAce
Michigan
USA

On 06/12/2010 01:53 PM, RHF wrote:
On Jun 12, 7:10 am, Bill wrote:
On 06/11/2010 08:14 AM, bpnjensen wrote:

On Jun 11, 6:42 am, wrote:
wrote:
Them bulbs, them bulbs, them dryyy bulbs, doooooo the work of the
Lawd,,,,

And there was Light.
What will Ford Motor Company (Ford has a better Idea, CLICK!) do if
Incandescent Light Bulbs are outlawed in America?
cuhulin

Incandescent panel lamps will still be allowed for a while at least
won't they?

*Something* with a dimmer switch. Runs on a battery anyway...

Uh, Guys,
The amount of electricity taken by the headlamps is totally
insignificant compared to the power to move the car, so I don't think it
is a priority with any car maker. They have almost all gone to LED tail
lights and turn signals since they don't burn out nearly as often, it at
all, and they can claim to be going high tech. Headlamps I have seen a
lot of halogen but when a car is coming at me it is damn near blinding
even on low beam.
There's up and then there's downs to any technology.
Lets hope the LED's when they finally make it to headlights can have a
better focused beam.
Bill Baka

The big saving to the Auto Makers is that the
new LED Lights can use a smaller Wire and
help reduce the Cost and Weight of the Car.
{= Improved Fuel Economy} ~ RHF
.
A few ounces (or grams) of wire won't make much of a difference. There
was some talk a few years back of running one power wire around the car
and having each light, widget, or doohickey have it's own IP address in
the car and have it all controlled by a master computer. Think of what
could happen if your car was controlled by a single chip computer and it
got a virus or just a bad chunk of code. Thankfully that has not
happened, yet.
Bill Baka