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(OT) Why the end of the lightbulb is a dark day for us all
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 |
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(OT) Why the end of the lightbulb is a dark day for us all
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#4
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(OT) Why the end of the lightbulb is a dark day for us all
On Jun 11, 1:37*am, "Brenda Ann"
wrote: "Bill Baka" wrote in message ... On 06/10/2010 08:44 AM, 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 I think they are already on the government's hit list. Sodium vapor lights? Turn on and wait for ignition??? LED's will probably be packed into a headlight assembly. I have a 5 year old Cat Eye LED bicycle light that is fair to middling in the light output category. Newer LED's are brighter but require some serious heat sinking, something that is do'able in a car for mass production. I think they would be more reliable too since I have had one filament break while the lights were on and I hit a big bump. The filaments are fairly robust when cold, but very weak when heated to make light. All 4 now, Bill Baka Our PX has some fancy Samsung LED floods in the parking lot. 75% cheaper to run than the metal halide lamps they replace, and even a bit more light.- Hide quoted text - - Show quoted text - So long as they're aimed downward and don't illuminate the night sky with wasted energy, I am all for them! ;-) Metal Halide lamps, especially unshielded, are the pits. Brilliant, sky-obscuring, and hard to overcome with normal amateur filter equipment. Bruce the Amateur Astronomer |
#5
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(OT) Why the end of the lightbulb is a dark day for us all
On Jun 11, 1:40*pm, Bob Dobbs 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 |
#6
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(OT) Why the end of the lightbulb is a dark day for us all
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. |
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(OT) Why the end of the lightbulb is a dark day for us all
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#8
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(OT) Why the end of the lightbulb is a dark day for us all
On Jun 11, 6:42*am, dave 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... |
#9
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(OT) Why the end of the lightbulb is a dark day for us all
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 |
#10
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(OT) Why the end of the lightbulb is a dark day for us all
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 I cannot speak to traffic lights, because they are necessarily aimed sideways into weather from *some* direction - but for general illumination, all you need is a housing that keeps the snow and ice off them. Not that hard to construct, and would serve the double purpose of eliminating light trespass and light pollution. Bruce |
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