Induction Lighting Guide

Why Choose Induction lighting over traditional lighting?

Whilst LED lighting is now commonly used in residential and commercial applications, Magnetic Induction Lighting is ideal for Industrial and some commercial applications in replacing traditional, energy inefficient lighting such as Metal Halide and High Pressure Sodium Lights. Magnetic Induction lights last approximately 20 times as long as traditional lights and use less than 50% of the energy to run.

Magnetic Induction lamps are typically fluorescent lamps with electromagnets wrapped around a part of the tube or inserted inside the lamp. Ecoglow Induction lamps are external inductor lamps and operate by high frequency energy sourced from the electronic ballast being forced through wires which are wrapped in a coil around the ferrite inductor which creates a powerful magnet. The strong magnetic field which travels through the glass, excites the mercury atoms in the interiors which are provided by a nodule of amalgam; a solid form of mercury. The mercury contained in Magnetic Inductions lights is minimal compared to what is typically found inside fluorescent lights;so minimal as to achieve a ROHS certification. When the Induction lamp is ready to be disposed of, the nodule of mercury can be broken off and disposed of accordingly and the rest of the lamp can be disposed of in land fill.

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The mercury in Induction lamps is necessary as the mercury atoms emit UV light which creates visible light when the phosphor coating on the inside of the tube is up-converted.

Magnetic Inductions lamps are either rectangular shaped or doughnut shaped. Ecoglow’s flood and tunnel lights are typically rectangular shaped and the high bays, doughnut shaped. The two shapes are determined by the housing and application.

Induction lights are usually available in 3500-6500K. Ecoglow prefers 5000-6500K as the higher the kelvin, the brighter the light output therefore, more suited to commercial and industrial applications.

Ecoglow Induction lamps have a typical lifespan of up to 100,000 hours approximately double the lifetime of traditional lamps. Please see the graph to the right which demonstrates a comparison of the typical lifespan of various lamps available on the market.

Explanation of why Induction lights are actually brighter than traditional lighting.

Firstly, please take note of the following terms:

Photopic Vision is the scientific term for human colour vision under normal conditions during the day (i.e. human perception of red, green and blue that the brain integrates to form full colour images of the world around us.)

Scotopic Vision is the scientific term for human visual perception in low light (night vision).

Mesopic Vision is the scientific term for the combination between Photopic and Scotopic vision taking into account the total sensitivity of the rod cells in the eye for the blue range, with the colour perception of the cone cells.

What wattage to choose when replacing traditional lights with Induction lights?

Our customers are often amazed at how bright Ecoglow’s Induction lights are. The benefits of over 50% energy savings compared to Mercury Vapors and Metal Halides as well as the long life time and instant start up make them a no brainer when it comes to saving on power costs.

According to the scotopic/photopic ratio, Induction lighting is brighter than traditional lighting to the human eye. Standard light testing technology today is not yet up to speed with the latest in Lighting technology. Using a light meter to compare light output, the Induction lamp is generally measured as producing less light than the conventional lamp even though to the eye, Induction lamps look the same in light output, if not brighter than traditional lamps. Scientific studies have shown the eye is more sensitive to blue wavelengths than the measurement curve of the light meter. Blue light, acting on human night vision (scotopic vision) is largely responsible for “visual acuity” or sharpness of vision. The issue faced is that light meters are calibrated using the 1951 CIE Colour space standards and the standard used to set the sensitivity curve for light meters does not take into account the contribution of scotopic vision to the sensitivity of the eye. Light meters and 1951 standards are now old fashioned and inaccurate when testing the light output of the Induction lights. This makes the choice of lighting confusing for consumers as they are relying on old light meter technology which does not prove the brightness of new technology like Induction lighting which can save them approximately 50% in energy costs as well as maintenance costs.

The human retina contains about 125million rod cells and about 6 million cone cells. These respond to different frequencies (colours/ wavelengths) of light in different ways. Cone cells are adapted to detect colours and function well in bright light, while rods cell are more sensitive but do not detect colour well as they adapt to low light.

Lumen Maintenance Chart

The Lumen Maintenance curve depicts the actual lifetime of the Visually Effective Lumens (light) as compared to other lighting scenarios. The induction lamp outlasts the competition whether it is HID (Metal Halide or High Pressure Sodium) or the newer T5 & T8 (fluorescent tube) anywhere from 3-5 times longer. All the time while maintaining an industry leading lumen output.

Using a conventional light meter or spectrometer, the light is measured to determine the photopic vision sensitivity curve. Using the same light source with a light meter calibrated to the scotopic, the scotopic sensitivity curve is determined. The resulting readings form an S/P ratio that can be expressed as a single number.

Induction light and Traditional Light Comparison

The ratio of Photopic light vs. Scotopic light in a lamp is called the S/P ratio. This ratio determines the apparent visual brightness of a light source. This is why the Ecoglow lamp will appear as bright or brighter to the human eye than a sodium vapor or metal halide of twice the wattage.

Light is measured in Lumens (Lux or foot Candles). The S/P ratio of a lamp is important as it provides a number that can be used to multiply the output reading of a lamp using a 1951 standard conventional meter to determine how much light, which is useful to the human eye, a lamp produces. These are known as Visually Effective Lumens (VEL).

Using a conventional light meter or spectrometer, the light is measured to determine the photopic vision sensitivity curve. Using the same light source with a light meter calibrated to the scotopic, the scotopic sensitivity curve is determined. The resulting readings form an S/P ratio that can be expressed as a Single number.

The chart below gives a comparison of Ecoglow Induction Lamps S/P ratio compared to other common industrial lamps. These figures are based on Data received from Francis Rubenstein of Berkley Labs.

S/P Ratio Example

Metal Halide – 400 watt has manufacturers rating of 56.9 lumens per watt . This results in 400×56.9=22,760 lumens x1.49 (S/P ratio) =33,912 Visually Effective Lumens.

Magnetic Induction – 200 watt has a manufacturers rating of 80 lumens per watt . This results in 200×80=16,000 lumens x2.25 (S/P ratio) =36,000 Visually Effective Lumens.

Scotopic Photopic Ratios

S/P ratios of various light sources

Low frequency Induction and High frequency Induction light comparison

Why choose Induction lighting over LED in high power lighting applications?

  • LED industrial lights produce a directional light, casting shadows/ causing dark spots.
  • Induction lights have a wider beam angle, creating an even spread of light.
  • LED lights on average can only withstand -20°C to 50°C causing failures in hot temperatures.
  • Induction lights on average can withstand temperatures of -30°C to 70°C
  • LED lighting is designed for directed/spot lighting. LED has to be ‘domed’, requiring many LEDs to create the effect of area lighting. This factor is expensive and more vulnerable to premature technical failures.
  • Induction Lighting technology is proven to be highly energy efficient. LED is still under much technical revision and unproven
    in high power lighting applications.
  • LED lighting has a lower efficacy, higher depreciation and heat output
  • Induction Lighting has a higher efficacy, lower light depreciation and produces less heat.
  • Induction lighting’s rated lamp life is twice as long as that of LED.