Author Topic: Led Lights  (Read 648 times)

Adam Mann

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Led Lights
« on: December 24, 2017, 01:46:53 PM »
The town of Markham is starting to replace the outdated standard light with led lights this    is a movement in the ideal direction.  We where declared a town in the last year, this is the first noticeable shift I have observed.



aftilicomp

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Re: Led Lights
« Reply #1 on: December 29, 2017, 12:06:44 AM »
Unless the new lights are of a better design they will not help and the light cannot be filtered out. LED lights do save energy encouraging even MORE lights!As the saying goes - be careful of what you wish for as you might get it!

unmoharib

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Re: Led Lights
« Reply #2 on: December 29, 2017, 09:44:07 AM »
They have a shield so the light only points down. The light is very directional from them also. The lighting for our purpose is better than the old lighting that we have. It will take quite some time to complete the conversion.

loraderclot

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Re: Led Lights
« Reply #3 on: January 01, 2018, 05:14:32 AM »
I just wish cities would install LESS lights. When you don't need headlights and can't tell they are off when driving at night it is too darn bright!

Corey Howell

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Re: Led Lights
« Reply #4 on: January 01, 2018, 06:12:02 AM »
I am with you on that one.

crypagsperless

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Re: Led Lights
« Reply #5 on: January 03, 2018, 03:13:59 PM »
A few years ago there was an "energy shortage" locally and "unnecessary" lights were turned off for a few days. This meant street lights on highways. The sky was darker. Accidents did not rise but after a short while the lights came back on. I did talk to the guy in charge about street lighting and how it ruined the night sky and he rolled his eyes and looked at me like I was wearing a tin foil hat.

Adam Mann

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Re: Led Lights
« Reply #6 on: January 07, 2018, 11:20:39 PM »
The energy saving idea could have worked but efficiency improvements will make things even worse. No politicians is going to win on a "turn off the lights "campaign but could win on a "turn the night in to day" slogan!

coatiorachin

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Re: Led Lights
« Reply #7 on: January 10, 2018, 02:20:35 AM »
Quote
The city of Markham is starting to replace the old standard light with led lights this certainly  is a move in the right direction. We where declared a city in the last year, this is the first noticeable change I have seen.
Up here in North Bay we had the LED lights retro fitted over the last couple of years. In my suburban setting the Bortle Class skies improved by about 1-2 numbers as a result. On those great seeing nights I can see M 81/82, M51 etc.from my backyard and they are located out over the city from my location. Those are my test objects as to sky conditions / seeing ability.

Ben Marquez

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Re: Led Lights
« Reply #8 on: January 10, 2018, 04:45:52 AM »
Quote
The energy saving idea could have worked but efficiency improvements will make things even worse. No politicians is going to win on a "turn off the lights "campaign but could win on a "turn the night in to day" slogan!

You might be right, but in my area, two pushes for “more light to stop the crime wave” failed.

In the first case a “citizen’s group” demanded brighter lights installed on the town’s main commercial street to “discourage gang activity”. The local police chief said “that will just make it easier for the drug dealers to count their cash.” It turned out that the “citizens group” consisted of the bar & store owners, who wanted the brighter lights to attract more business – and the “gang activity” was mostly related to their opening up their upper floors to after-hours raves. The new lights never happened.

In another nearby city, the “crime wave” resulting in the demands for “more lights” consisted of early morning fights on an open plaza area between local youth and college kids. The police noted that the bars were pushing their patrons out their back doors at closing time – and into the otherwise unused plaza. The police recommended cutting the lighting to discourage the ‘patrons’ from hanging around after the bars closed, and also that the bars make patrons exit their front doors onto the city sidewalk. Again, the new lights never happened.

migresinli

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Re: Led Lights
« Reply #9 on: January 10, 2018, 06:42:07 AM »
Quote
<p class="citation">QuoteThe city of Markham is starting to replace the old standard light with led lights this certainly  is a move in the right direction. .....
Up here in North Bay we had the LED lights retro fitted over the last couple of years. In my suburban setting the Bortle Class skies improved by about 1-2 numbers as a result. ..... [/quote]

Well that’s good to read!! 

I’m still hopeful that the change to LED streetlights will offer a good chance to reduce sky glow. It offers an opportunity for a public discussion of light pollution, and lighting levels, and perhaps even more local regulation.

Even if the new LED lighting is brighter and bluer (which is subject to discussion even after installation, because LED streetlights can be easily dimmed), it could still improve sky glow because these lights are all (nearly all??) full cut-off, and therefore will reduce the upward directed light. Yes there will be greater reflection off the ground *if* the new LEDs are brighter, but I believe that this would be more than off-set by the full-cutoff design. Personally, I’d consider less sky-glow a plus, even if it is bluer in color.

Zack Tucker

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Re: Led Lights
« Reply #10 on: January 10, 2018, 04:17:04 PM »
Quote
<p class="citation">Quote<p class="citation">QuoteThe city of Markham is starting to replace the old standard light with led lights this certainly  is a move in the right direction. .....
Up here in North Bay we had the LED lights retro fitted over the last couple of years. In my suburban setting the Bortle Class skies improved by about 1-2 numbers as a result. ..... [/quote]

Well that’s good to read!! 

I’m still hopeful that the change to LED streetlights will offer a good chance to reduce sky glow. It offers an opportunity for a public discussion of light pollution, and lighting levels, and perhaps even more local regulation.

Even if the new LED lighting is brighter and bluer (which is subject to discussion even after installation, because LED streetlights can be easily dimmed), it could still improve sky glow because these lights are all (nearly all??) full cut-off, and therefore will reduce the upward directed light. Yes there will be greater reflection off the ground *if* the new LEDs are brighter, but I believe that this would be more than off-set by the full-cutoff design. Personally, I’d consider less sky-glow a plus, even if it is bluer in color. [/quote]The new LED lights up here are still a white light, no blue visible, although they are much more pure / sharp in intensity they definitely do not reflect the light in any noticeable amount, after hitting the ground, back up into the atmosphere to cause sky glow. You really notice the difference between before and after on a rainy / damp night when moisture in the air reflects any stray light from street light fixtures above the horizontal plane of the lighting head ie now no noticeable light reflection upwards above the head, whereas before the light glow would completely surround the fixture. That is the effects of full cutoff and it is nice to see ! You really do have to witness it yourself to know what I am saying.

blasbunmena

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Re: Led Lights
« Reply #11 on: January 11, 2018, 03:17:30 PM »
An article on the situation in Flagstaff regarding LED streetlights can be seen at http://azdailysun.co...ting-to-prot...

Dave Mitsky

ifaclidis

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Re: Led Lights
« Reply #12 on: January 12, 2018, 01:08:58 AM »
I noticed a friend of mine near NYC said his town was switching to LEDs as well with a downward lighting design.. As a longtime fan of efficiency I've Beene using led bulbs in my house for many years, from back when they were really expensive.  Almost all of them are still working great, about 10 years. It's a great alternative and the hues and color temps have gotten really good. It's nice that they're getting put in a housing/mount  that is sky friendly!

Jeremy Kelley

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Re: Led Lights
« Reply #13 on: January 12, 2018, 11:37:02 PM »
Quote
An article on the situation in Flagstaff regarding LED streetlights can be seen at http://azdailysun.co...ting-to-prot...

Dave Mitsky
I think you will find that the problem in Flagstaff with lighting pole failure is a rare occurrence that may only pertain to that one area as most of these installations are structurally reviewed / inspected by a qualified engineer to certify that these types of failures don't / won't occur. Somebody took a shortcut that could put someone in a liability situation. Up here in North Bay the LED heads are retrofitted to the existing luminaire arms including new wiring from the power source, All of this is supported / mounted on, in most cases, on 80 - 90' wood poles that also carry power / telephone / cable TV  supply cables. Failures have never to this date occurred and this type of  utility design is common / standard for all communities. The bottom line is that what was shown in this link is not normal for most situations and as I said before you have to witness it personally to know what it is all about. I wouldn't take the Flagstaff occurances as the norm and as to low pressure sodium being a good alternative I would want to research it a little more, LED lighting is progressing in leaps and bounds and not always to the detriment of the environment.