Talk:LED street light

Energy efficiency? Please provide me with proof that LED's are "more energy efficient", well actually don't bother you won't. Current technology is more efficient, I am removing that comment.

WSJ resource
Cities, Utilities Are Poles Apart Over Streetlights December 24, 2011 by Kate Linebaugh, excerpt ... 99.190.86.5 (talk) 05:06, 28 December 2011 (UTC)
 * See Efficient energy use 99.181.153.29 (talk) 07:14, 29 December 2011 (UTC)

Information sought
I was hoping this page would be able to answer some questions I had, but currently it cannot. I'm interested in knowing what colour temperatures the LED street lights are available in, and whether this is a feature designed for how humans behave in such environments, or simply a byproduct of the switch to LEDs, similar to the switch to the orange sodium lights. The LED streets lights I've seen produce a cool light (moonlight to daylight, or colder) similar to how I recall the old white mercury lights. Also, would a difference in colour temperature (wavelengths) matter? That is, would the higher-energy wavelengths be slightly dimmer, or would the street light use slightly more energy?24.57.210.141 (talk) 03:00, 23 February 2012 (UTC)

LEDs tend to be available for most of the visible spectrum. Although Hg lamps produce white light (by monochromatic emissions at 436 nm, 546nm and 578 nm), it severely effects night vision (shorter wavelengths beach out cells in our eyes). Longer wavelengths, ( like HPS bulb) tend to reduce the effect. With shorter wavelengths, more energy is required to allow the electron to make the necessary jumps between various shells and produce photons ( see work function and energy of an electron). Hope that helps. User formally known as kb1koi — Preceding unsigned comment added by 68.0.234.210 (talk) 13:30, 6 April 2012 (UTC)

City installations without references
I am considering to remove all the cities from that list that have no refrences. Any objections?--Thorseth (talk) 13:53, 10 July 2012 (UTC)

That strikes me as a sound idea. Especially considering the uselessness of that list. 19:19, 31 July 2014 (UTC) — Preceding unsigned comment added by 66.28.221.133 (talk)

Health Concerns and Disadvantages
I believe these two sections should be merged as some points were repeated in both. — Preceding unsigned comment added by 206.116.79.141 (talk) 04:44, 19 October 2014 (UTC)

Notable installations section
Is this section worth keeping as is? It seems to be mostly an ever-increasing list of places that have installed some LED streetlights. We're probably past the point at which it is no longer notable to simply have LED streetlights. I suggest that we get rid of the list entirely and just list a few milestones (e.g., first installations, largest cities, most complete installations, whatever). If we keep the list we should decide what makes an installation notable and trim the list accordingly. Meters (talk) 18:28, 15 November 2014 (UTC)
 * I agree - when the technology was in limited distribution such a list made sense; but with it relatively mainstream, it doesn't really serve an encyclopedic purpose. I could see listing milestones as you suggested (where reliable sources exist) - but otherwise, the "Installations (not comprehensive)" list (formerly labelled "Notable installations") should be purged. --- Barek (talk • contribs) - 17:40, 20 April 2015 (UTC)
 * Per the reasons above, I've removed the list. --- Barek (talk • contribs) - 21:09, 28 November 2015 (UTC)

Blue light hazard
Blue light of sufficient intensity can disturb melatonin production; however, the important point is level of intensity. It has been shown by medical practitioners that 8 hours work-related exposure to fluorescent light, e.g. CFL, white LED, etc, at 250 Lux or less has no measurable effect; a similar controlled experiment estimated 10% suppression at 250 lux; other less realistic studies (forced dilation) showed only 50% suppression at 100 lux and negligible suppression at 50 lux. Street lighting depending on classification has specified average intensity of 2-15 Lux i.e. nowhere near a sufficient intensity for biological response.

A lot of the data for suppression comes from experiments where subjects are subjected to chemically induced forced dilation and exposure to very bright spectrally selected light which is hardly relevant to life experience; similarly, experiments where they wake sleeping subjects and expose them to intense light, recording a sleep disturbance! Even with e ,chemically induced dilation, there is no measurable melatonin suppression at 50 lux. In any case, one should not make too much from limited experiments under contrived conditions that are far from replicating normal all-day light exposure experience. Also, many experiments actually use arbitrary 'white' or 'room' light whose intensity is measured with a standard, i.e. spectrally weighted, light meter rather than a calibrated spectrometer, so the CCT and/or blue component isn't assessed; in fact, there is evidence that sufficient intensity at any wavelength can produce LIMS (some experimenters used QH lamps which produce negligible short wavelength light). Another issue is that the vast majority of test subjects overall are 18-28 years of age.

If one is concerned, one should compare the blue light component of white LEDs to that of mercury, metal halide or xenon for example; it should even be noted that lamps of this class installed into a fixture with the incorrect glass are also a source of UVA. For a direct comparison, one should also factor in uniformity of illumination as non-LED luminaires produce a more intense central spot and must be overall brighter to achieve the required minimum intensity at the margin. Oddly enough, no one has ever worried about blue and UV light from these types of lamps used in street lighting. 99.241.228.72 (talk) 22:35, 2 December 2015 (UTC)
 * Is there a suggestion for an improvement to the article here? If not this is off topic and should be collapsed. The talk page is for discussing the article, not the topic. Meters (talk) 22:55, 2 December 2015 (UTC)

LED Street Light Manufacturers | LED Street Light Suppliers
thanks for publishing this post, it will be more helpfull to our products — Preceding unsigned comment added by Technosphereinc (talk • contribs) 04:08, 29 November 2016 (UTC)

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