LED Lighting Introduction-Application

Light emitting diodes (LEDs) have been used for years, primarily in the electronics industry for circuit board mounted indicator lights. Increased performances (brightness), lower production costs, and the availability of a variety of colors have led to the successful use of LEDs in replacing incandescent and flourescent lamps in architectural, commercial and industrial applications.

White LEDs

There are currently two ways to make white light with LEDs. One method mixes multiple wavelengths of different LEDs to make white light (i.e. RGB); allowing the lighting designer to tune the white light to a specific color temperature
The second method uses a blue Indium-Gallium-Nitride (InGaN) LED with a phosphor coating to create white light. This is the method that results in the more commonly seen “white LED.”
 

High Color Rendering Index (CRI)

CRI is the calculated rendered color of an object. The higher the CRI (based upon a 0-100 scale), the more natural the colors appear. Natural outdoor light has a CRI of 100. White LEDs offer the industry’s highest CRI, making objects to be illuminated appear more natural and vibrant.

Conformal Phosphor Coating Process

The conformal phosphor coating process uniformly coats the LED with phosphor. This eliminates the blue-ring effect common to other white LEDs and delivers the consistent white color throughout the light beam making the best white LED lighting source available today.
 

1. Does LED Lighting require a ballast like Fluorescent or High Press Sodium Lighting?
   No. LED Lighting uses a power supply (called LED driver) inside of the light fixture or on the back side of the lighting fixture. Therefore, when replacing traditional lighting with LED you need to disconnect the ballast.
    
2. What is the function of the LED driver in the LED Lighting system?
   Most commercial applications operate from 120 VAC, 208/220 VAC, or 277 VAC. Normally, a single LED’s Voltage is DC 3.0-3.5V, and the current of the single LEDs is 350ma. LED’s require constant current regulation, rather than traditional constant voltage.
   Virtually all of the key characteristics of LED lighting applications are directly related back to or have implications for the LED Driver. A quality driver is critical.
    
3. How does the light distribution of LED Lighting compare with traditional lighting?
   Traditional incandescent and high pressure sodium lighting emit 360 degrees of light and employ reflectors to collect and redirect the light. This method results in wasted light, or “lighting pollution.” LED Lighting is unidirectional, and can be designed to focus light where needed most.
    
4. What wattage LED streetlight replaces an existing High Pressure Sodium?
   28W, 42W LED Streetlight can replace a 75W HPS Streetlight.
   42W, 56W, 70W, 84W LED Streetlight can replace a 150W HPS Streetlight.
   98W, 112W, 126W, 140W LED Streetlight can replace a 250W HPS Streetlight.
   154W, 168W, 182W, 196W, 210W LED Streetlight can replace a 400W HPS Streetlight.
   

5. What is the life of a LED Streetlight?
   LED Streetlights degrade slowly over time. Life is calculated based on the projected amount of time for the light to reach 70% of its original brightness, called the L70. typically this is 50,000 hours or 13.7 years if on for 10 hours per day

6. Which LEDs does Electro-Matic Products HighLight LED Lighting use?
   Cree Xlamp chip or Cree LED.

7. What information is needed to specify a light?
   Many factors must be considered in order to determine the perfect light for each application. Electro-Matic Products, In.c have developed a lighting questionnaire to assist you in gathering all the information needed for us to simulate your project.

• Opposite Symmetrical Streetlight

• Opposite Across Streetlight     

• Twin Central Streetlight             

• Single Sided Streetlight