Streetlights usually refer to a series of lighting devices that are mounted on a column, pole, or post and are separated along the road or highway, improving the safety of drivers and pedestrians. It is an important part of urban lighting. Traditional streetlighting generally uses high-pressure sodium or metal halide as lighting sources, matching with the reflectors and ballast. It is not very ideal in terms of energy-saving and contains toxic gases, which are very unfavorable to the protection of the environment. Today, when the concept of energy-saving and emission reduction is advocated.
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With the continuous development of LED technology and the continuous reduction of costs. More and more road projects are constantly using LED street lights to replace traditional street lights. From the appearance, some modular street lights look like modular LED flood lights, which also can be used as road lights for area lighting because their design and beam angle are almost the same.
For LED road lighting, generally -K Warm white,-K daylight, -K cold white options. What is the difference between these color temperatures?
♦ -K Warm white. It looks like yellow lighting, similar to high-pressure sodium bulbs. Compared with cool white light and natural light, warm light has a stronger penetrating power. It means that in rainy and foggy weather, people can see a long distance to the LED street light with warm color light, which will improve the safety of drivers driving on rainy days. However, the K warm white has relatively low lumens.
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♦ -K Natural white. This is the color most like sunshine light. In real life, this color temperature of street light fixture is popular, it looks like a Metal halide lamp.
♦ -K cold white. The color temperature of -k will make people visually very cold and dazzling, which will lead to excessive visual fatigue, and under this color temperature condition, people’s ability to observe from a distance will also decrease, reducing the driving safety of drivers. But in these color temperatures,-K led chips can be with much higher lumens output, saving much more energy, and that is the main reason why most of the customers purchase street led lights with -K.
Conclusion: It is better to do LED street lights with warm white K or less than k if it is installed in a rainy and foggy place. From experience, it is ok to buy -k types, which have the highest lumens output.
Generally, the street light pole is 3meter 4meter 5meter 6meter 8meter 10meter 12meter 14meter optional. You should choose different pole heights for your detailed projects. For some urban main roads, the street lights are generally installed more than 8 meters apart. But for some residential areas, street lights are often only installed less than 6 meters in height. What is more, you also decide how tall the street lights are according to the wattage, such as led street lights 150W 200W, generally installed on the top of the 8-meter-12-meter pole, but 50W 80W LED Street lights only are with 6-meter street light pole.
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LED street lights weigh less, because they use a transistorized switch mode ballast just like the RF driven VHO CFL. Induction street lights have struggled with long term durability not due to lamp but ballast failures. Solid state HID ballasts are used all the time by indoor growers. It's much easier to get them to regulate lamp operation better than CWA, weighs less and costs less. The real truth is that high frequency SMPS ballasts are substantially cheaper to make in China and ship them here which makes it that much more profitable for online retailers. High power passively cooled SMPS ballasts have terrible track record for RF interference and reliability. This is why they're not used for demanding applications and HIDs continue to use the conventional ballast despite the high cost.
What happened to the interest of domestically produced goods?
LED lighting probably has the highest Made in China contents of electrical goods. Made in China of Chinese made components from top to bottom and there is a significant China "IP" troll issues around LED. Have you seen how China is heavily invested into LEDs?
LED manufacturing is actually subsidized by none other than the Chinese government. http://www.ledinside.com/news//...tal_rmb_12b_subsidies_from_chinese_government
The LED industry recycled the same theory that's been tried and pitching kelvin as LED technological advancements. Look in street light equivalence claims for LED lights from 5-7 year ago. The LED wattage needed match HID has been growing despite increasing LED efficacy.
The push for higher kelvin LEDs was an attempt to justify then extremely expensive and poor efficacy LEDs using scotopic enhancement multiplier to place LEDs into a favorable market position. Things that should not change are changing again right now, because those are the same smoke and mirrors recycled by the LED industry to position then costly LED lumens into competitive position with traditional lighting and they had to justify a very high wattage gap in order to make any type of ROI happen with the extremely expensive LEDs of the time that had inferior lm/W to HPS.
The higher kelvin LED as an attempt to reduce cost by lacking lumen output is severely criticized.
https://spectrum.ieee.org/green-tech/conservation/led-streetlights-are-giving-neighborhoods-the-blues
LED Light Pollution - Business Insider
Scotopic/mesopic amplification has been ongoing at least since the s and it wasn't perceived too well. The idea to leverage scotopic amplification has been tried but LED industry dragged it back out again.
Lighting Research Center RPI 68-.pdf
Saving wattage by shaving lumen and using scotopic multiplier has been tried over and over.
K 80+ CRI full spectrum ceramic metal halide that drops right into HPS fixture has been available for a long time, yet they didn't get popular with street lights. I didn't think that somehow trying to copying that with LEDs would go well and it didn't. There were also induction VHO CFL 865 which weren't received anymore favorably than small businesses trying out K CFL only to switch back.
We're still tolerating pure non-sense like the use of L70 to define lumen maintenance for LEDs. The LED industry has been rather quiet of the fact 30% depreciation is worse than F40T12/CW from s did not have lamp lumen depreciation as bad as what is allowed for LEDs. LEDs are very much like historic mercury vapor lamp in that the lamp seldom burn out but continue to lose lumen.
The efficacy gain through LEDs don't look so amazing when lumen loss is accounted for. An LED lamp that terminates at 560 lumen in 11,000 hours (note: 800 lumens out of box) is not an equivalent to 60W 860 lumen lamp that lasts 1,000 hours and changed 10 times. They're implying fading to 560 lm is fine. Since incandescent lamps don't accumulate much fading before they fail, that LED lamp is an equivalent to a 600 lumen lamp.
The higher kelvin LED as an attempt to reduce cost by lacking lumen output is severely criticized
I have worked on the lighting manufacturer side and on the public side of specifying LED luminaires and designs have always conformed to IES lighting requirements for designs; I had not heard of utilizing higher kelvin LED as an attempt to reduce cost, unless you observe it from the angle of higher kelvin LEDs are more efficacious. I have seen the IES lower lighting levels as they historically noted designing to average footcandles for designs; designing to averages and not minimum levels of light benefited HID sources but hurt LED sources as HID had high foot candle levels under the pole.
K 80+ CRI full spectrum ceramic metal halide that drops right into HPS fixture has been available for a long time, yet they didn't get popular with street lights. I didn't think that somehow trying to copying that with LEDs would go well and it didn't.
HPS lamps compared to Ceramic Metal Halide lamps are much more affordable (1/10th the cost typically) and you didn't really benefit much with the longer life (by maybe a few thousand hours) and the energy savings wasn't ground breaking (400W HPS versus 310W CMH for example).
I will say I agree with you very much on the L70 aspect; utilizing TM36 to calculate the average life of LEDs seems to extrapolate a lot of "lab" data and cap it for manufacturers at 6 times the testing of the source to allow for its rated life. From the installations I have observed though for the past 7 years, LED luminaires have held their own. When it comes to not having to go out and service a street light, taking a bucket truck, setting up temporary traffic control, having a warehouse to store materials and lamps, and all of the other jazz that came with HID during its hayday, I'd say LED technology is doing well, but once again, glare caused by high driver currents will be what hurts it as manufacturers try to reduce the number of LEDs and start to utilize chip on board technology.