LED Street Lighting 95% energy efficient with Solar Panel
GreenHead
http://www.greenledlight.com/led_lights/streetlight_eel_energy_efficient.html
This is gross, but real the US does produce 50% power with coal.. can
you imagine what the earth must look like digging that much coal out of
it? Can anyone say swiss cheese!
US Street Light Energy Consumption
Figures from 2006 show 49% of the capacity for generating electricity in
the United States is fueled by coal.
An average value for the thermal energy of coal is approximately 6150
kilowatt-hours(kWh)/ton.
Roadway lighting consumes 14 Billion kWh annually in the United States.
Thats 1.167 Billion kWh per month used for Street Lighting / Roadway
Lighting
Divide that in two, since 49% of 1.167 Billion kWh of usage is Coal
Generated.
So now we have 583 Million kWh PER MONTH generated by coal used only on
Street Lighting.
How much CO2 does that produce?
583,333,333 kWh X 0.32Kg CO2 /kWh For Coal Generated Electricity =
1,822,916,666 Kg CO2/kW Month for Street Lighting alone in the US.
Converted to US Tons:
2,009,421.66 US Tons of CO2 every Month on Streetlights Only
mogga
<timbernos...@hotmail.com> wrote:
>How much CO2 does that produce?
So what happens if there are no street lights? Does crime increase? Do
people substitute with external lighting on their own properties?
Where my dad lives there's one streetlight and that's on the corner by
the pub carpark. That's it.
It's amazing at night you can see the stars so well!
(and the dull yellow-orange glow of the M5 in the distance)
Would pedestrians be more at risk without street lighting?
John Beardmore
<d...@NOSPAMPLEASEmogga.com> writes
>>How much CO2 does that produce?
>
>
>
>So what happens if there are no street lights? Does crime increase?
Indeed.
:)
Could crime be cure completely by putting mirrors into orbit to provide
perpetual daylight ?
> Do
>people substitute with external lighting on their own properties?
People light the outsides of their properties anyway.
>Where my dad lives there's one streetlight and that's on the corner by
>the pub carpark. That's it.
Excellent !
>It's amazing at night you can see the stars so well!
>(and the dull yellow-orange glow of the M5 in the distance)
Malvern way ? Colwall ?
>Would pedestrians be more at risk without street lighting?
Possibly, but how much risk should we eliminate as the amount of energy
used tends to infinity ?
Cheers, J/.
--
John Beardmore
John Beardmore
<timbernos...@hotmail.com> writes
>C/P from
>http://www.greenledlight.com/led_lights/streetlight_eel_energy_efficient
>.html
>This is gross, but real the US does produce 50% power with coal.. can
>you imagine what the earth must look like digging that much coal out of
>it? Can anyone say swiss cheese!
They can, but get real about the % of material removed.
>US Street Light Energy Consumption
>Figures from 2006 show 49% of the capacity for generating electricity
>in the United States is fueled by coal.
>
>An average value for the thermal energy of coal is approximately 6150
>kilowatt-hours(kWh)/ton.
>
>Roadway lighting consumes 14 Billion kWh annually in the United States.
>
>Thats 1.167 Billion kWh per month used for Street Lighting / Roadway
>Lighting
>
>Divide that in two, since 49% of 1.167 Billion kWh of usage is Coal
>Generated.
>
>So now we have 583 Million kWh PER MONTH generated by coal used only on
>Street Lighting.
>How much CO2 does that produce?
>
>583,333,333 kWh X 0.32Kg CO2 /kWh For Coal Generated Electricity =
>
>1,822,916,666 Kg CO2/kW Month for Street Lighting alone in the US.
>
>Converted to US Tons:
>
>2,009,421.66 US Tons of CO2 every Month on Streetlights Only
Assuming your sums are correct.
Mogga
<woo...@wookie.demon.co.uk> wrote:
>In message <vp1gu21rak1c7f04m...@4ax.com>, mogga
><d...@NOSPAMPLEASEmogga.com> writes
>>On Thu, 01 Mar 2007 19:32:27 GMT, GreenHead
>><timbernos...@hotmail.com> wrote:
>
>>>How much CO2 does that produce?
>>
>>
>>
>>So what happens if there are no street lights? Does crime increase?
>
>Indeed.
>
But a huge % of crime is done via back doors which aren't lit my
street lights anyway - and tea time crime is very common also in
cities when it might not be done by street lighting.
>
>:)
>
>Could crime be cure completely by putting mirrors into orbit to provide
>perpetual daylight ?
>
concentrate the light and use it to zap burglers :)
>
>> Do
>>people substitute with external lighting on their own properties?
>
>People light the outsides of their properties anyway.
>
>
>>Where my dad lives there's one streetlight and that's on the corner by
>>the pub carpark. That's it.
>
>Excellent !
>
>
>>It's amazing at night you can see the stars so well!
>>(and the dull yellow-orange glow of the M5 in the distance)
>
>Malvern way ? Colwall ?
>
edge of Lower Broadheath. 7 miles from the Malverns.
I don't remember ever being up on the Malverns at night (without being
in one of the pubs first anyway) so can't recall the view at night)
>
>>Would pedestrians be more at risk without street lighting?
>
>Possibly, but how much risk should we eliminate as the amount of energy
>used tends to infinity ?
>
They only get hit and injured by things with lights on (well thats the
theory - some cyclists don't use lights) so making yourself visible
enough (battery powered led jackets maybe?) should solve the problem.
Of course where pavements are it shouldn't be a problem - and crossing
the road, well they spend £3M a year on trying to teach kids how to do
that.
Do street lights turn off during the night? Would activity switched
ones work as a better way of saving energy?
>
>Cheers, J/.
John Beardmore
<d...@nospamohpleasenospammogga.com> writes
>On Fri, 2 Mar 2007 21:43:16 +0000, John Beardmore
><woo...@wookie.demon.co.uk> wrote:
>>In message <vp1gu21rak1c7f04m...@4ax.com>, mogga
>><d...@NOSPAMPLEASEmogga.com> writes
>>>On Thu, 01 Mar 2007 19:32:27 GMT, GreenHead
>>><timbernos...@hotmail.com> wrote:
>>>>How much CO2 does that produce?
>>>
>>>So what happens if there are no street lights? Does crime increase?
>>
>>Indeed.
>
>But a huge % of crime is done via back doors which aren't lit my
>street lights anyway - and tea time crime is very common also in
>cities when it might not be done by street lighting.
Indeed to that too.
My guess is that the amount of crime largely depends on other factors,
but the proportion of it that happens in dark alleys depends on the
amount of street lighting.
>>:)
>>
>>Could crime be cure completely by putting mirrors into orbit to provide
>>perpetual daylight ?
>
>concentrate the light and use it to zap burglers :)
>>>It's amazing at night you can see the stars so well!
>>>(and the dull yellow-orange glow of the M5 in the distance)
>>
>>Malvern way ? Colwall ?
>>
>
>edge of Lower Broadheath.
OK.
> 7 miles from the Malverns.
>I don't remember ever being up on the Malverns at night (without being
>in one of the pubs first anyway) so can't recall the view at night)
I certainly remember it as being among the best areas in the UK a decade
or so ago.
:) Double vision certainly increases the number of stars visible...
>>>Would pedestrians be more at risk without street lighting?
>>
>>Possibly, but how much risk should we eliminate as the amount of energy
>>used tends to infinity ?
>
>They only get hit and injured by things with lights on (well thats the
>theory - some cyclists don't use lights) so making yourself visible
>enough (battery powered led jackets maybe?) should solve the problem.
Fibre optic jacket in one of my friends cases !
>Of course where pavements are it shouldn't be a problem - and crossing
>the road, well they spend £3M a year on trying to teach kids how to do
>that.
:)
>Do street lights turn off during the night?
Some, but only a small proportion I think.
> Would activity switched
>ones work as a better way of saving energy?
Probably, but the most efficient lamps tend to have long warm up times.
Assuming that that problem can be solved, can we have transponders to
tell street light 'not to bother on our account' ?
