Access Fixtures Induction Light Fixtures

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Invented in 1890 by Nikola Tesla and used commercially over the past 16 years, induction technology is basically fluorescent lamp lighting without electrodes. It uses magnetic induction to ignite the phosphors instead of electrodes. The main advantages of induction technology are as follows. Electrodes are a significant point of failure on traditional fluorescent lamps causing more frequent replacement. Induction lamps do not have electrodes and consequently have an extremely long life, rated at 100,000 hours. Also, the lack of electrodes makes them more reliable in high-vibration applications. The second major advantage is the ability to use light generating substances that would react with metal electrodes in normal lamps, enabling the use of higher performance substances for more light.

Induction technology delivers an unequaled 100,000 hours of high quality white light which makes them virtually maintenance free. After 100,000 hours, 50% of the drivers will be surviving and at 60,000 hours about 10% failures are expected. 100,000 hours of life is 11 years of life even when run 24/7, or 25 years when operated 10 hours per day. Induction fixtures are virtually maintenance free. That is the equivalent of 100 incandescent lamps, 5 HID lamps, or 5 typical fluorescent lamp life cycles.

The light generated is a crisp white light with 80+ CRI, high reliability and instant on/off. Induction fixtures provide stable light output over a wide range of ambient temperatures, maintaining at least 85% of nominal lumens from -30° F to 130° F when used in an enclosed fixture with a heat sink. Additionally, induction systems can start at temperatures as low as -40°F.

Induction fixtures are energy efficient, too. A 250w Induction lamp can be compared to a new probe start 400w Metal Halide from a light output standpoint, however a 250w induction fixture uses 265 watts while the 400w HID uses approximate 454 watts. The savings is 189 watts. If operated 5 days a week, 12 hours a day and electricity costs $.12/kwh the annual savings in just energy is $69.93 per fixture. The maintenance and replacement savings are significant, too. Another one of the advantages is that induction fixtures operate at a lower temperature than competitor fixtures reducing cooling costs where applicable.

Induction Benefits Summary

  • Reduces energy use by over 50% as compared to HPS
  • Reduced maintenance cost with 4 to 10 times the lamp life
  • Improved safety conditions with more consistent performance
  • Improved Security conditions with crisp whiter, higher CRI light
  • Enhanced visual performance with high CRI
  • More environmentally friendly solution using less energy and less waste disposal
  • May qualify for energy company rebates

How Induction Works — Internal Magnetic Induction

In a variation of this technology, internal magnetic induction lamps use a light bulb shaped glass lamp, which has a test-tube like re-entrant central cavity. This cavity is coated with phosphors on the interior, filled with inert gas and a pellet of mercury amalgam. The induction coil is wound around a ferrite shaft which is inserted into the central test-tube like cavity. The inductor is excited by high frequency energy provided by an external electronic ballast (generator) causing a magnetic field to penetrate the glass and excite the mercury atoms, which emit UV light, that is converted to visible light by the phosphor coating by the phosphor coating.

How Induction Works – External Induction Lamps

External magnetic induction lamps are essentially fluorescent lamps with electromagnets wrapped around a section of the lamp tube. High frequency energy, from the electronic ballast (generator), is sent through wires, which are wrapped in a coil around the ferrite inductor, creating a powerful magnet. The induction coil produces a very strong magnetic field which travels through the glass and excites the mercury atoms in the interior which are provided by a pellet of amalgam (a solid form of mercury). The mercury atoms emit UV light and, just as in a fluorescent tube, the UV light is up-converted to visible light by the phosphor coating on the inside of the tube. The system can be considered as a type of transformer where the inductor is the primary coil while the mercury atoms within the envelope/tube form a single-turn secondary coil.

Images from Fulham

How Long Will an Induction Lamp Operate?

External induction lamps manage heat either by convection through the air or conduction into the fixture. Induction lamps operate with a higher internal temperature and must cool by conduction to the base heat sink and by radiation through the glass walls. With induction, a small percentage of mercury ions are absorbed by the phosphor coating over time; once the mercury ions inside the envelope are depleted, the lamp emits only a very dim light and has to be replaced.

Induction Rated Lumen Maintenance is largely determined by operating temperature of the lamp and quality of lamp design. The induction systems used by Access Fixtures are designed and manufactured with high quality tri-phosphors and solid amalgam to optimize the performance and rated life of the lamp. The above chart is intended to represent an average rated lumen output stated as a percentage of the initial lumen output over the rated life of the lamp. Operating the lamp within the temperatures specification will typically result in an average estimated 70% lumen output at 60Khrs.

How Can an 84 Watt Induction Luminaire Replace a 150w HPS Luminaire?

The answer is found in how the human eye responds to light and how lighting sources affect vision. To better understand consider the following scientific terms and how they relate to vision:

  • SCOTOPIC VISION –The scientific term for human visual perception in low light(night vision); directed by rod cells in the human eye.
  • PHOTOPIC VISION –The scientific term for human color vision under normal conditions during the day, directed by cone cells in the human eye.
  • MESOPIC VISION –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 color perception of the cone cells.

Extensive research has been conducted to better understand Mesopic vision; more specific how Scotopic vision which stimulates the photoreceptors called rods in the human eye to cause pupil contraction and increased visual acuity. It was found that scotopically enhanced light appeared brighter even when light levels were reduced; thus the potential to reduce wattage and improve lighting.

The ratio of Scotopic light vs. Photopic light in a lamp is called the S/P ratio. This ratio determines the apparent visual brightness of a light source. Induction lighting produces a high S/P ratio and this is why the 85w lamp appears as bright or brighter to the human eye than a sodium vapor or metal halide of twice the wattage. Visual Effective Lumens (VEL) is a key factor in vision.

Check out our line of Induction Sports Lighting! 

Long life, high CRI & efficacy are major factors for selecting induction fixtures

Type Lumens per Watt Life Color Rendering Index
Incandescent 15 to 25 L/WT 1000 Hours 90 CRI (100 for Halogen)
Florescent 50 to 100 L/WT 10,000 to 20,000 hours 54 to 90 CRI
Induction 65 to 90 L/WT 100,000 hours 85 CRI
Metal Halide (MH) 60 to 80 L/WT 10,000 to 20,000 hours 60 to 80 CRI
Pulse Start MH 100 L/WT 20,000 hours 60 to 80 CRI
High Pressure Sodium 80 to 140 L/WT 24,000 hours 20 CRI
Low Pressure Sodium 100 to 180 L/WT 18,000 hours 20 CRI
Features Advantages Benefits
No filament or electrodes to be damaged Long performance life up to 100,000 hours Few to no lighting outages due to system failure
Uses high voltage and high temperature resistant capacitors High lumen maintenance, >85% after 6,000 hours Virtually zero maintenance costs
Highest quality capacitors, resistors, and crystal diodes Superior reliability as compared to virtually all other lighting types No re-lamping or recycling costs for 10 years or longer
Electronic ballast with power factor > 0.99 System efficiency of 50% over magnetic ballasts Reduce energy costs up to 50% as compared to HID systems
High lumen efficiency of 80 to 90 Lumens per Watt (LPW) Better lighting and visibility Better visibility enhances employee performance
Significant energy savings Lower energy bills and total system cost of ownership Substantial cost reductions improves profitability
Pre-wired for 120v or 277v Low cost of installation Easy installation
Instant start and instant re-strike Will function in most commercial and industrial environments Easy to use
Reliable starting to -40C   Works in very cold environments
Color Rendering (CRI) of >80 High CRI enables colors to appear naturally and correct Increases safety and security
Available in 2700, 3500, 4000, 5000, and 6500 Kelvin The appropriate operating color is available for any purpose Helps protect eyesight
Working frequency of 210KHz Flicker free performance U.V. applications @ 253.7Nm
Amalgam content of < 0.25mg Less mercury entering the waste stream Health and environmental safety/protection
Harmonic distortion meets the International L Class Standard Less chance of interference with the electrical grid Electrical grid safety
Electromagnetic Compatibility meets international standards Less chance of harm to electronic devices Safe for use near other electronic devices
Lamps/Ballasts are listed & certified by CE, FCC, UL, & ISO World wide acceptance Great for use in virtually any facility and location
Lamp/Ballast Type Wattage System Wattage Lamp Life CRI Mean Lumens Mean Pupil Lumens
High Pressure Sodium 70 88 24,000 21 5,670 3,232
High Pressure Sodium 150 188 24,000 21 14,000 7,980
High Pressure Sodium 250 300 24,000 21 25,600 14,592
High Pressure Sodium 400 464 24,000 21 45,000 25,650
High Pressure Sodium 1000 1,100 24,000 21 126,000 71,820
Induction 40 41 100,000 80 3,400 5,508
Induction 80 82 100,000 80 6,800 11,016
Induction 100 102 100,000 80 8,500 13,770
Induction 120 122 100,000 80 10,200 16,524
Induction 200 204 100,000 80 17,000 27,540
Metal Halide 150 188 15,000 65 11,300 16,837
Metal Halide 175 215 10,000 65 10,000 14,900
Metal Halide 250 295 10,000 65 17,000 25,330
Metal Halide 400 456 10,000 65 28,800 42,912
Metal Halide 1,000 1,070 12,000 65 92,900 138,421
Low Pressure Sodium 180 220 16000 0 26,100 9,918
Low Pressure Sodium 135 178 16000 0 19,140 7,273
Low Pressure Sodium 90 124 16000 0 11095 4,216
Low Pressure Sodium 55 80 18000 0 6655 2,529
Low Pressure Sodium 35 60 18000 0 4000 1,520
Lamp/Ballast Type Wattage Lamp Changes Over 10 Years Energy Used Over 10 Years Maintenance Over 10 Years Material Cost Over 10 Years Cost of Operation Over 10 Years
High Pressure Sodium 70 3.7 $927 $201 $73 $1,201
High Pressure Sodium 150 3.7 $1,971 $201 $73 $2,245
High Pressure Sodium 250 3.7 $3,154 $201 $73 $3,427
High Pressure Sodium 400 3.7 $4,878 $201 $73 $5,151
High Pressure Sodium 1000 3.7 $11,563 $201 $224 $11,988
Induction 40 0 $429 $0 $0 $429
Induction 80 0 $858 $0 $0 $858
Induction 100 0 $1,072 $0 $0 $1,072
Induction 120 0 $1,287 $0 $0 $1,287
Induction 200 0 $2,144 $0 $0 $2,144
Metal Halide 150 5.8 $1,971 $321 $187 $2,479
Metal Halide 175 8.8 $2,263 $482 $278 $3,022
Metal Halide 250 8.8 $3,101 $482 $280 $3,863
Metal Halide 400 8.8 $4,793 $482 $280 $5,556
Metal Halide 1,000 7.3 $11,248 $402 $365 $12,014
Low Pressure Sodium 180 5.5 $2,308 $301 $345 $2,954
Low Pressure Sodium 135 5.5 $1,873 $301 $257 $2,432
Low Pressure Sodium 90 5.5 $1,306 $301 $203 $1,809
Low Pressure Sodium 55 4.9 $838 $268 $161 $1,267
Low Pressure Sodium 35 4.9 $629 $268 $161 $1,057
Based on 24 hours, 7 days per week operating time
Based on $ 0.12 KWH and $55 per hour for Labor and Equipment such as lift trucks

Click here to learn about the U.S. Government's Department of Energy's information on Induction lighting.

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