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Old 23-03-2006, 07:22   #16
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Re: Light Pollution

Quote:
Originally Posted by chav1
wouldnt it be a good idea for motorway lights to do the same to save electricity
No. If you wanted to turn them on and off like that you could not use SON type discharge lights, these require up to 5 minutes or more to reach full light output and wont re strike after switching off for several minutes while they cool down. So instead of using 70w or 150w lamps you would need to use 500w lamps to get the same light output. You can see if would be difficult to save any money unless the road is a very quite one.
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Old 23-03-2006, 09:34   #17
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Re: Light Pollution

Quote:
Originally Posted by chav1
under the railway bridge in accy the lighst come on as a car approaches , wouldnt it be a good idea for motorway lights to do the same to save electricity
Apart from the council tax cost think how much you could save on road tax. It is odd that more accidents seem to happen on well lit roads than those without light. Maybe we are more alert when driving on a darkened road.

As for switching them on and of as cars pass give the job to an illegal immigrant they would soon want out. Can you get energy saving bulbs for road lighting?
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Old 23-03-2006, 09:42   #18
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Re: Light Pollution

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Originally Posted by SPUGGIE J
Can you get energy saving bulbs for road lighting?
They always have been. A 150w SON gives more light output than a 500W halogen flood light
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Old 23-03-2006, 09:54   #19
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Re: Light Pollution

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Originally Posted by Neil
They always have been. A 150w SON gives more light output than a 500W halogen flood light
Learn something new every day.
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Old 23-03-2006, 13:04   #20
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Re: Light Pollution

Im with Mez i have one because we have cctv on the front drive we have 3 cars in an area where they like to brake them!! so our light needs to be there so you can get a picture in the night.

The folks accross the road fitted one to their front and it doesnt bother me at all in fact we dont need street lamps when they are both on together!!
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Old 23-03-2006, 20:01   #21
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Re: Light Pollution

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Originally Posted by Acrylic-bob

Why is it that some sections of motoway are not lit at all - the M55 - and that is not deemed to be unsafe, while other sections - M6 - have so many lights that it is positively painfully bright.
Sorta' worked alongside this guy for 16 years who was Chairman of the Public Accounts Committe >> obviously this question was being discussed. Asked me if I thought would be better ? Could only reply, not necessary, but a damned site easier, however, did read later that lighting for miles and miles lulled drivers to sleep, more dangerous and you are more alert in unlit roads as Spuggie has pointed out.

Just think, if I had given a more positive answer, could have had the whole motorway system lit up by now.
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Old 23-03-2006, 22:51   #22
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Re: Light Pollution

There is a danger where you pass from lit to dark or dark to lit, can't remeber which way round it is.
Neil is right as usual, sodium vapour lights are the most efficient light you can get, down side being that they're orange, but that doesn't matter for roads, highlighting some buildings, and for some security purposes. Even if you used flourescents, which do get used in some signlights, they take time to warm up, so would be no good for roads.
Not that good for cameras though, but if you use a hallogen spot on a pir and shine it where its needed, down, not across, then it's not expensive to run, and not light polluting. I do agree with niel, who's right again, that a lot of the time a 150 would be plenty, especially just to light a path or small yard.
If you want constant cheap illumination for a camera, i'd use flourescents floods, although they can cause flicker on the camera, or mercury vapour , which is white like halogen.
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Old 23-03-2006, 22:55   #23
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Re: Light Pollution

On the passive sensor sensing the curtains, only thing i could think, is that you must have something hot in your room, and when you draw the curtains it blocks it. I've heard of passives picking up changes in heat through windows, but it's just hearsay, I've never encountered it .
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Old 23-03-2006, 23:12   #24
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Re: Light Pollution

bout the only thing that does work at accy rail!!
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Old 24-03-2006, 00:53   #25
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Re: Light Pollution

I'd comment jooby but i'm not a local so can't lmao.
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Old 24-03-2006, 07:19   #26
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Re: Light Pollution

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Originally Posted by katex
Asked me if I thought would be better ?
Not meaning to insult you Kate but that sounds typical of the people who make important decisions. Why on earth would he ask your opinion on something I suspect you are not qualified to comment on. Should he not have based his decision on facts relating to technical, cost and safety aspects?
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Old 24-03-2006, 07:24   #27
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Re: Light Pollution

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Originally Posted by Madhatter
or mercury vapour , which is white like halogen.
Metal Halide provide a nice white light and are efficent. They are a discharge type light so take a few minutes to warm up. They can usually be used on SON gear so can be used as a direct replacement. Many of the new street light fitted around us are now white and I suspect they are using metal halide lamps. Only problem for home use is they are quite expensive compared to a £5 150w B&Q halogen light fitting with PIR.
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Old 24-03-2006, 16:19   #28
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Re: Light Pollution

Quote:
Originally Posted by Madhatter
I'd comment jooby but i'm not a local so can't lmao.
dont they have lights where you are ..?

if you want we can start a thread about annoying candles
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Old 24-03-2006, 18:12   #29
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Re: Light Pollution

Quote:
Originally Posted by Neil
Not meaning to insult you Kate but that sounds typical of the people who make important decisions. Why on earth would he ask your opinion on something I suspect you are not qualified to comment on. Should he not have based his decision on facts relating to technical, cost and safety aspects?
Sure it was decided on all aspects here Neil and definitely not on my humble opinion, and was just 'off the record' as someone who did an enormous amount of driving, how I found the difference between lit and unlit motorways. Nowt wrong with that, is there ? As you know, the Public Accounts Commitee are the watchdog on all Public spending and cost/ safety and all technical aspects would have been the main criteria as well as users experiences.
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Old 27-03-2006, 23:30   #30
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Re: Light Pollution

Quote:
Originally Posted by chav1
dont they have lights where you are ..?

if you want we can start a thread about annoying candles
We have gas lights. We have a railway station, thats not got a ticket office chav, i only commented that i agree yours shouldnt be closed, and that appearance is everything and got bad karma and told to find a local forum.
This is a local forum for local people chav.
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