What you should know about LEDs!

The evolution of lighting from HID to LED

LED and high-intensity discharge (HID) lamps are some of many lighting technologies that are available today. Knowing the difference between HID and LED can help us to make an wised decision on what’s best for your application and budget.


1896 Dowsing and Keating of England patented a mercury vapour lamp, considered by some to be the first true mercury vapour lamp. This type of lamp creates an electric arc through vaporized mercury that produces a bluish-green light. An outer bulb envelope insulates the bulb and protects against ultraviolet radiation. Mercury-vapor lamps are the oldest type of HID lighting and are being phased out because of the increased efficiency and better color rendition of metal-halide lights.


In 1960, much like in mercury-vapor lamps, an electric arc is created through vaporized mercury. However, metal halides (such as sodium, indium, and thallium) are added to increase efficiency and improve the light’s color-rendering index (CRI). An outer bulb envelope insulates the bulb and protects against ultraviolet radiation.

High-Pressure Sodium:

This type of HID lamp uses mercury vapors and sodium to ignite an electric arc, which produces a gold-colored light that is used mostly in parking garages.

Light-Emitting Diodes (LEDs)

LEDs produce the longest-lasting, most energy-efficient lighting available today. A semiconductor rich in electrons and a semiconductor rich in holes are used to create an LED. Passing a current through the junction of these two materials combines the electrons with the holes and produces photons, which is the light that you see. LED lights have endless application possibilities. In addition to industrial lighting, they’re great for under-cabinet lighting, landscape lighting, vehicle lighting, work lighting, home lighting, and commercial lighting.

What you should know about LEDs

  • LEDs run much cooler than HID bulbs and don’t require high running temperatures to work properly, which greatly increases their longevity and enables them to function in cold temperatures.
    • Unless an LED light is specifically infrared (IR) or ultraviolet (UV), it produces little to no IR or UV radiation, which can be damaging to skin, eyes, and fabrics.
    • They can last up to 50,000 hours—three times longer than HID bulbs and fixtures.
    • Power consumption is the lowest compared to all other lighting technologies – 80 percent less than HID bulbs.
    • LED lights contain no mercury, harmful gasses, or toxins.
    • Many of these bulbs are shatterproof and shock resistant.
    • They illuminate instantly unlike HID bulbs that can take several minutes to reach full brightness.
    • LED lights require higher initial investment but are the best value due to energy savings and longer life spans.
    • They are available in many different colors and variations of white.
    • Because of their low power consumption, LED lights are great alternative lighting solutions for solar-powered systems.

If you want to know more details of LED light or want to purchase LED Corn Lighting Bulbs, please call 86-755-27165559 and speak with one of our knowledgeable staff members or E-mail to seo@guankeled.com for more advice on LED LIGHTS.