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Old February 20th, 2011, 10:38 PM   #41
ChrisZwolle
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City light pollution is nothing compared to greenhouse light pollution on cloudy nights.
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Old February 20th, 2011, 11:35 PM   #42
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I think this argument is somewhat similar to the one of using halogen vs. HID (high intensity discharge) lamps for cars' headlights.

HID have many advantages (I can attest to that personally - the HIDs on my car make it much more comfortable to drive at night than the halogen lamps on my parents' car), but people complain that they produce too much glare with oncoming traffic (which is also true). Apparently part of the reason for this glare is not just their higher brightness, but the fact that the human eye is more sensitive to the HID wavelengths, which resemble daylight.

I don't think we have any LED streetlighting in the Toronto area so I can't comment on it.
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Old February 21st, 2011, 12:17 AM   #43
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City light pollution is nothing compared to greenhouse light pollution on cloudy nights.
Greenhouse light pollution?
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Old February 21st, 2011, 12:32 AM   #44
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Vlaketunnel in The Netherlands is the first 100% LED tunnel of the world.
Nice and bright.
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Old February 21st, 2011, 04:45 AM   #45
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I think this argument is somewhat similar to the one of using halogen vs. HID (high intensity discharge) lamps for cars' headlights.

HID have many advantages (I can attest to that personally - the HIDs on my car make it much more comfortable to drive at night than the halogen lamps on my parents' car), but people complain that they produce too much glare with oncoming traffic (which is also true). Apparently part of the reason for this glare is not just their higher brightness, but the fact that the human eye is more sensitive to the HID wavelengths, which resemble daylight.
I really hate glare from cars' headlights, but from my experience that mostly comes from ones with the projector-style lens, the older shiny reflector type is much better, regardless of whether they're HID or halogen. (My uncle's Prius has HID headlights with the older reflector thing behind it to put the light where it belongs) And you may say that the HID headlights are designed to keep glare out of peoples' eyes but most of the time that doesn't work for me and I'm blinded anyway. I'd be quite glad to see projector headlights banned. They may help the driver of the car using those headlights see what's in front of them, but nothing in front of them will be able to see anything at all. (Or at least I can't.) I'm quite glad to stick with my old-fashioned halogen bulb with the shiny reflector, but the outer lens does kinda need to be polished...

The ancient sealed-beam headlights are, for me, the absolute best as far as limiting glare goes, but they also severely limit the car's aesthetics so I don't mind newer "multiple parts with separate bulb" headlights.
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Old February 21st, 2011, 06:13 AM   #46
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Quote:
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I think this argument is somewhat similar to the one of using halogen vs. HID (high intensity discharge) lamps for cars' headlights.
Yeah, those are bright. The newer City busses and RCMP vehicles have them. Low (dipped) beam, is high beam intensity. A friend of mine has HID on all her vehicles. I'm planning on getting them for my truck... If I ever get the money. $300 PER headlight. Plus tax.

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Greenhouse light pollution?
Some greenhouses use powerful floodlights to simulate daylight. Basically they are stadium lights, in terms of brightness. Because a greenhouse is translucent, there is an unreal amount of light pollution.
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Old February 21st, 2011, 10:32 AM   #47
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Old March 19th, 2011, 01:24 PM   #48
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Here in Esbjerg Denmark, we are presently testing some LED streetlamps from Maalstrom. Before and after pictures below.:





And a closeup of the Maalstrom LED light fixture.:



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Old March 19th, 2011, 01:47 PM   #49
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I'm happy not to have such an LED right by my house. Way too much light. Maybe people don't understand the concept of darkness. LED's should be placed along major trafficked roads, not residential streets...
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Old March 19th, 2011, 01:50 PM   #50
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I wouldn't want to live in house near such streetlight.
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Old March 20th, 2011, 01:01 AM   #51
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I wouldn't want to live in house near such streetlight.
That's what curtains/blinds are for. Personally, I'll take the brightness. At least that way, I can see the dumb sh*ts who's have to wear dark clothing and no reflective gear.
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Old March 20th, 2011, 04:53 PM   #52
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I'm guessing the brightness has been exaggerated a little with long exposure..
Very likely. Digital cameras can't take good pictures at night with an exposure of less than a second.
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Old March 20th, 2011, 07:26 PM   #53
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You have to shoot both "before" and "after" photos with the same exposure, ISO, aperture and white balance to get an accurate result.

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Originally Posted by nerdly_dood View Post
Digital cameras can't take good pictures at night with an exposure of less than a second.
Not necessarily but it does require high-end equipment.

Last edited by Rebasepoiss; March 20th, 2011 at 07:34 PM.
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Old March 20th, 2011, 08:05 PM   #54
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One advantage that I do note in that fixture design is that due to the extreme directionality of individual LED 'pixels', those 'pixels' can be rearranged as necessary to cut glare onto adjoining properties, focusing that light to where it is needed the most.

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Old March 22nd, 2011, 04:54 AM   #55
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Although it could be the camera, it's equally possible that the bulb is overated. My city has been recently replacing low pressure sodium with metal halide on residental roads and it floods the street; complete overkill.
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Old April 14th, 2011, 06:59 PM   #56
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LED lighting now also on the Danish motorway system.:

http://elektronikbranchen.dk/nyhed/f...nske-motorveje

The need for lightfixtures is reduced to the half, and energy consumption by 60%. Normally two rows of lightfixtures are needed, but with these new LED lamps one row will do. Production Philips in Denmark.

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Old April 15th, 2011, 08:15 AM   #57
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Quote:
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Here in Esbjerg Denmark, we are presently testing some LED streetlamps from Maalstrom. Before and after pictures below.:





And a closeup of the Maalstrom LED light fixture.:



I'm curious, do these at least have the option to dim?

Some cities in the U.S. are talking about LED streetlights tied into a "smart" system that are dim in the evening and increase brightness as the sun sets into the night.
Also I read an article (can't remember when and where) about LED streetlights that can flash and light up red and/or blue to help emergency responders locate the vicinity of a property easier at night.
Are any other countries currently utilizing this?
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Old April 16th, 2011, 09:18 PM   #58
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Also I read an article (can't remember when and where) about LED streetlights that can flash and light up red and/or blue to help emergency responders locate the vicinity of a property easier at night.
A simple GPS system in the emergency vehicle seems simpler and much easier to implement than this proposal.
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Old April 16th, 2011, 11:51 PM   #59
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Some cities in the U.S. are talking about LED streetlights tied into a "smart" system that are dim in the evening and increase brightness as the sun sets into the night.
We have this project in Oslo too. And for low-trafic tunnels the lights are cut completly if there are no cars during the night.
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Old April 17th, 2011, 06:37 AM   #60
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extreme directionality of individual LED 'pixels'
Modern third-generation LEDs have very wide-angle visibility, but just like normal incandescent or halogen lights, they've got to have some apparatus to put the light where it's most wanted for best effect, usually a lens to concentrate the light into a narrow, intense beam of light, or a reflector to spread it out. Second-generation LEDs are very rare because third-gen ones came out very soon after 2g was introduced. Some LED products are advertised as using 4th or 5th-generation LEDs, but third-gen ones are most common, and IMO plenty bright enough.

First-gen LEDs, often referred to as 5mm LEDs, must be arranged so densely and in such a large quantity for proper light output that if anything was used to disperse or concentrate the light other than the integral 5mm housing, they'd be too dim to be worth using.
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