Posted on 01/30/2015 5:42:48 AM PST by thackney
Before the start of the 2014 NFL regular season, University of Phoenix Stadium in Arizona, home to Super Bowl XLIX, retrofitted 312 high-performance light-emitting diode (LED) stadium light fixtures. The LED fixtures replaced more than 780 metal halide high-intensity discharge (HID) fixtures and will illuminate the field during the Super Bowl on February 1.
University of Phoenix Stadium was the first stadium in the NFL to light its playing field using only LEDs. The new lights draw approximately 310 kilowatts of energy compared with the 1,240 kilowatts required by the old system, a savings of about 75%. Assuming an electricity cost of 15 cents per kilowatthour, that means the new LED lighting costs about $47 per hour to light the field, compared to $186 per hour using the HID lighting system. Lighting maintenance costs for LEDs are also expected to be lower. The vendor also projects a 30% decrease in stadium cooling costs as a result of the LED fixtures, which generate less heat than HID lights. Given the limited hours that stadium field lighting is used, there are other considerations beyond energy costs and savings for selecting LED lighting. The light output from LEDs may allow for better color representation and more detail during televised viewing, especially during slow-motion replays, improving picture quality as consumers adopt higher definition displays. In addition, the LED lights turn on without the 15-20 minute warmup period required by metal halide and other HID lamps. In the unlikely event of a power failure such as occurred during Super Bowl XLVII at the Superdome in New Orleans, LED field lighting could return as soon as power was restored.
Although University of Phoenix Stadium was the first NFL stadium to light the playing field exclusively using LEDs, it is not the only NFL venue using the technology. Levi's Stadium in San Francisco uses LED lighting to illuminate 40% of the stadium, and NRG Stadium in Houston recently installed 480 luminaires with 650,000 individual LEDs to help light the playing field.
So lumen measurement is relative to lighting technology?
An entire article that provides the economic benefits and quality improvements of lighting with LED, without a hint of “global warming” as a reason.
Very refreshing.
LED's operate cooler. Which means cooler air temps in the stadium.
Cooler air temps mean less pressure in the footballs.
He is at it again
I hate LED lights, but it is from an aesthetics perspective; the light is cold looking. Prefer the warmth of yellow-hued lighting, which is why I also hate fluorescent.
> So lumen measurement is relative to lighting technology?
Lumens is a measurement of light output / brightness so I would say yes
Do length measurements vary by the form of conveyance, too?
In addition, the LED lights turn on without the 15-20 minute warmup period required by metal halide and other HID lamps.
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That and the savings in cooling costs are the real benefits. The cost for electricity with the old lights was minimal.
LED doubled probably means it will be the same. My experience with LED lighting and the new energy saving bulbs is that you have to buy double the lumens you need to get the same rating as what you need. We’ll see here in a few days.
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You get what you pay for. If you buy the higher end Philips bulbs you get everything claimed. There are also sites on the web with results of LED bulb tests. Some are a lot better than others.
I’ve only ever had one LED light fail a Fenix TK-10 which is a cheap Chinese light (in the realm of tactical lights). That was a regulator circuit that died.
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Did Fenix replace it? They are one of the better brands.
I hate LED lights, but it is from an aesthetics perspective; the light is cold looking. Prefer the warmth of yellow-hued lighting, which is why I also hate fluorescent.
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Some LED bulbs produce warm light. The ones with a 2700 temperature rating are indistinguishable from incandescent. The same goes for fluorescent.
Only the cheap type LED. Good LED will provide a better range of light spectrum than most other choices. The ones in the stadium of this article actually use sensors to adjust the color spectrum as the light through the semi-clear top changes.
Note the range of Color Temperature (measured in Kelvin) for LED bulbs.
https://www.1000bulbs.com/category/led-light-bulbs/
Compare this:
https://www.1000bulbs.com/product/110818/SYLVANIA-11373.html
to these:
How do LED bulbs function in temperature lower than 30 degrees F?
I am thinking of replacing the fluorescent tube lights in my unheated garage with LED’s. I have also seen LED’s that screw directly into an old fashioned incandescent fixture like all pre 1980 houses have in the garage, closets and basements. They are available at Home Depot for $19.95. However, they are only 60 watts equivalent light output.
I need at least 100 watts for the garage & basement.
I know I could replace the fluorescent tubes with low temp fluorescents like I had in my old house/garage.
I’ve learned about LEDs the hard way. My experience.
60w LED appears brighter than a comparable incandescent to me.
Kelvin rating is something to consider when buying LEDs.
2700K is about the color of an incandescent, higher K temperature gets whiter.
Many cheap LEDs are 3000K or higher, ugly, harsh IMO.
Some LEDs, Feit Brand bulbs sold by Costco can cause RF. It states so on the back of the pkg in little tiny print. I called the Co., BTW
Don’t use them near a radio. I took them back.
Home Depot sells Cree bulbs, Made right here in Morrisville, NC.
60W equiv. about $5.
But designer bulbs? Too much $$. I’ll wait on the candelabras, globe prices to come down before I replace them.
And last. I’m stuck with a bunch of nasty CFLs. :^(
Here’s a lumens vs watts chart if that’s what you’re asking:
http://www.rapidtables.com/calc/light/how-lumen-to-watt.htm
A major factor in the lifespan of an LED bulb is its operating temperature. Unlike fluorescent sources, cold temperatures do not impact the performance of LEDs, though higher temperatures may.
http://g7power.com/bulb-lifespan/
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Example:
https://www.1000bulbs.com/pdf/plt-101233a19fr-specs.pdf
• Operating Temperature: -40°F to 185°F
https://www.1000bulbs.com/product/113449/PLT-101233A19FR.html
LED lighting comes in other color temps than cold harsh white. And RGB LEDs can be any color you want them to be.
Lumen is light output. That term is used instead of the old watts terminology as it is more accurate a representation of the light from the bulb.
Foot candles is the measurement of what yore lighting. So 277 foot candles on the field, is comparable to having 277 candles burning per square foot.
Thank you for the info.
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