Understand Led Bulb

An overview of led bulb

The Vista Ridge Tunnels are highway tunnels through the Tualatin Mountains ("West Hills") of Portland, Oregon, United States. Located in the Goose Hollow neighborhood, the tunnels pass through a hillside locally known as Vista Ridge which is a half mile (1km) west of downtown Portland. Sunset Highway, also known as U.S. Route 26, is carried through the tunnels, three lanes in each direction. They are Oregon's busiest tunnels.

The eastbound tunnel is 1001 feet (305 m) in length; the westbound tunnel is 949 feet (289 m). Both have 41ft (12.5 m) of horizontal and 15.58ft (4.75 m) of vertical clearance. The eastbound tunnel was completed in 1969, the westbound a year later.

There is a six-percent grade through the tunnels. Most of the tunnels' lengths are straight, though they curve southward at the west ends 35°.

The tunnels were built with ventilation shafts which were never used. Instead, the shafts were later adapted for electrical wiring, so as to improve tunnel illumination without marring the tunnels' appearance with visible conduit.

To improve tunnel safety for motorists, and decrease the tunnel lighting requirements, the original tunnel entrance faces were sandblasted to remove white paint and repainted a less luminescent tan color to reduce the range of visual light adaptation required by drivers. At one time there were computer-based electronic light controls, but they were replaced by relatively simple photo detectors and relays for durability and simplicity. The night lighting level is enabled permanently and is supplemented by two or three levels of daytime lighting.

Except directly over the tunnels, the hillsides are steep and undeveloped forest, with some residential development along the top of the ridges. Landslides occasionally occur, but are usually minor and quickly cleared.

The tunnels have been closed to hazardous material transport since November 1, 1994.

As a result, US 26 is closed to hazardous material transport between I-405 and Oregon Route 217.

The tunnels are located nearly at the bottom of a hill where the road gradient averages 6.5% over 2.25mi (3.6km). Close to the east portals is a 130-foot (40 m) tunnel underpass carrying SW 18th Avenue. Just outside the west portals is a 650-foot (200 m) tunnel under the lanes which carries eastbound Canyon Road

from the exit ramp into Goose Hollow. The Robertson Tunnel for MAX Light Rail is underground approximately 800 feet (250 m) to the west.

An electronic sign giving motorists real-time information on travel times to Highway 217 under current conditions, and other messages as needed, was installed above the east portal of the westbound tunnel in June 2017 and was activated in August 2018.

The tunnel's internal lighting was upgraded to LED in July 2020. The replacement lights use about half the electricity of the previous high pressure sodium vapor bulbs and require replacement every 15-20 years instead of every two to four years. The LEDs have a color temperature of 4000 K.

LED bulbs, how many watts should i get?

You'd better choose 9W LED bulbs,Here the lead lighting(www.lead-lighting.com)specializing in LED solutions including interior and exterior LED light analysis of intensity distribution of led bulb with the traditional energy saving light and make an actual test for us to see how bright LED light is in the end

An ambient temperature : 28 degrees Humidity : 60%

Test results are as follows :

1.A traditional energy-saving lamps : average intensity : 60.40cd average intensity per watt : 60.40cd/16.81w ( actual measured ) = 3.59cd / w

2.led Bulb : average intensity : 52.47cd per watt average intensity : 52.47cd/2.69w ( actual measured ) = 19.50cd / w

comparative analysis of led bulb with energy saving lamp :

led bulb / energy saving lamp : 19.50cd/w/3.59cd/w = 5.4 times, that the power consumption of led bulb is 5/27 that of energy saving lamp, energy-saving rate is 82%.

How bright LED in the end ? How many differences between the brightness of ordinary energy-saving lamp and that of LED bulb? .

First, test conditions

Time: evening after dark ( to ensure that no interference of other source)

Location: a laboratory company

Testing equipment : light meter ,the probe is 1 meter away from the lamp .

Second, the test fixture :

13W energy saving lamp , 3.4W LED bulb , 5W LED Bulb , 1.8W LED bulb.

Test Conclusion

From the above comparison test , we can see

The brightness of 1.8W LED bulb is equivalent to that of ordinary 25W incandescent bulbs ; same illumination , the power consumption of ordinary light bulb is about 13 time more than that of LED ;

The brightness of 3.4W LED bulb is equivalent with that of 13W energy saving lamp, under the same illumination , the power consumption of energy saving lamp is 3.8 times more than that of LED light .

Cree Gets Connected for $14.97 of led bulb

DURHAM, N.C.-(BUSINESS WIRE)-Cree, Inc. (CREE) introduces the Connected CreeLED Bulb, the first smart LED bulb to deliver the combination of the lighting experience customers expect from Cree with industry-leading simplicity, multi-platform compatibility and affordability.The new 60-watt replacement Connected Cree LED Bulb is compatible with Wink and ZigBeecertified hubs and is available at The Home Depotfor just $14.97, a price poised to drive adoption."Everything Cree does is based on the promise of providing the best lighting experience, and that starts with superior LED light.The Connected CreeLED Bulb delivers on that promise while also creating a simple user experience for consumers seeking device connectivity in their homes," said Betty Noonan, Cree chief marketing officer."The Connected CreeLED Bulb provides the uncompromising combination of a superior LED light experience with multi-platform compatibility, all at an affordable price."

Today's Connected Cree LED Bulb is compatible with Wink and ZigBee certified hubs, allowing consumers to control the Connected Cree LED Bulb from anywhere by simply installing the bulb and compatible hub, syncing the devices and customizing the settings using your iOSor Androidsmartphone.Easily dim or brighten the lights to the perfect setting, schedule lights to come on at the start of each day or turn lights on while away for added security.The Connected Cree LED Bulb is also designed for compatibility with future Cree supported hubs and market-leading platforms such as the AppleHomeKitplatform as consumers adopt new platforms for home connectivity."We are excited to support the ConnectedCreeLED Bulb, as it complements Wink's mission to make the connected home accessible," said Brett Worthington, GM, Wink."The ConnectedCreeLED Bulb delivers on this promise by providing an amazing lighting experience combined with simple setup with the Wink app."

Related Quotes

Just like theCree LED Bulb, the Connected Cree LED Bulb emits a warm, omnidirectional light thanks to its 4Flow Filament Design.This innovation creates a compact, optically balanced light source inside a durable, shatter-proof housing.The Connected Cree LED Bulb is available in a 60-watt replacement option, delivering 815 lumens in a soft white (2700K) color temperature.Backed by a three-year warranty, the Connected Cree LED Bulb consumes 81 percent less energy*, has a rated lifetime of 25,000 hours and is dimmable via smartphone app.Consumers can purchase the Connected Cree LED Bulb online and in The Home Depot stores later this month.* Based on Cree LED Bulb 60-watt replacements at 11.5-watt, $0.11 per kilowatt-hour, 25,000-hour lifetime and average usage of three hours per day.