Comparing LED High Bay with Metal Halide High Bay

Technology

Over the last few years, the traditional highbay light has seen a large transformation. The good old days of High Intensity Discharge (HID) or T5 highbays has given way to the new LED products that are far more energy efficient.

LED Long High Bay  

With new LED technology, light illumination is created by the constant movement of electrons in a semiconductor material. The heat LEDs produce is quickly absorbed into a heat sink giving it a high source efficiency

Metal Halide High Bay  

In the old Metal Halide construction, light is produced by passing an electric arc through a gaseous mixture of vaporized mercury and metal halides chemical compound. The inefficient ballast and unfavorable operating temperature make the source efficiency low

Directionality

Usually, it is more important to emit light onto a specific target area rather than to all directions (360 degrees) around the bulb. As such the ability to direct light to a certain area is important.

LED Long High Bay  

The unidirectional characteristics of LED lights transmit light only within a 120 degree direction. It can direct most of the light produced at the source to where it is needed. Hence, its system efficiency can remain high.

Metal Halide High Bay  

Metal Halide does not transmit the light to the target directly. It radiates out at a 320 degree angle from the source and relies on the fixture to direct it towards the target, resulting in substantial losses in usable light. The system efficiency is thus very low.

LED Metal Halide Equivalent

When replacing Metal Halide lamps with LED lamps, the equivalent sizes of lamps are as shown. This shows that a much smaller watt sized LED lamp can replace a larger metal halide lamp.

LED Long High Bay  

Metal Halide High Bay  

Comparing equivalent sizes of LED High Bay & Metal Halide High Bay
LED High Bay Metal Halide High Bay
100W 300W
120W 300-400W
150W 400W
200W 700W

Lumen Depreciation

Lumen depreciation is the process in which the total output of lumens a fixture produces decreases during its lifetime. The rate at which a fixtures lumens depreciate can depend on a multitude of factors which include the type of lighting technology used, total hours used, and various other factors

LED Long High Bay  

Typically, LED high bay gradually loses its brightness to 70% of its initial brightness after 50,000 operating hours.

Metal Halide High Bay  

Whereas, Metal Halide quickly lose its brightness to 60% of its initial value after only 10,000 operating hours.

Light Spread

A group High Bay lights should produce an even spread over the entire area of the space to be illuminated. Care should be taken to avoid "white spots" which refers to higher concentration of light below the fixture.

LED Long High Bay  

Long LED High Bay produces an excellent spread of light without "white spots" due to its LED chips layout and the optical lens fitted to it.

Metal Halide High Bay  

Metal Halide High Bay causes "white spots" due to it's inability to evenly spread out the light by just the use of reflector.
All Rights Reserved Thai Waterline Systems LTD. Co., 2018 ©    
phone linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram