Magnetic induction lamps are basically fluorescent lamps with electromagnets wrapped around a part of the tube, or inserted inside the lamp. In external inductor lamps, high frequency energy from the electronic ballast, 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.
- High lighting efficiency: more than 65-90 lm/w
- High colour rendering index: 80, high resolution & clear and clean colour.
- High power factor: more than 0.95 resulting in less investment in power cable.
- Optional colour temperatures (2700-6500K) suitable for difference needs.
- Constant wattage output: The output wattage is less than 3% with the input voltage variation at ±20%.
Induction lamps offer the benefits of financial savings through:
- Energy Savings
Induction Lamps have a high lighting efficiency. The efficacy is between 65-90 lm/w for lamps from 40W to 300W respectively. The cost savings comes from the actual lighting design application. Lighting application must take into account things such as the rate of light depreciation, the colour rendering required by the client and so forth because the light depreciates very slowly. Good designs are possible with the knowledge that the light loss factor is very low.
The only deficiency when it comes to using induction lamps is the heights. As one goes higher to heights of 15-25 meters, there is a trade-off between the numbers of induction lamps required versus the energy savings. However, the maintenance savings at these heights is significant enough to warrant investing in induction lamp technology.
- Maintenance Savings
Induction Lamps have a life expectancy of between 80,000 to 100,000 hours. This is equivalent up to 4 re-lamps for HPS and Mercury Vapour lamps. Over and above this, induction lamps have a high lumen maintenance rate (low light decay) of 70% after 60,000 hours.
Over and above that, Induction lamps offer benefits in the areas of:
- Health and Safety
Quick start: Instant start whenever lighting supply is cut off. This also occurs even when the lamp is hot or if ambient temperature is low (-40 to -50 degrees).
High-frequency working, no flash and soft lighting for eyesight protection. There is no flicker and glare that impairs vision and strains the eye.
- Environmental Protection
Uses Solid Mercury: 0.25mg of mercury per 100W of light.
Less waste on lamp replacements: lamps last up to 100 000 hours providing for less waste in terms of phosphor disposal.
Total Cost of Ownership
While the initial investment in induction lights appears to be high, the total cost of ownership is more than half of that when comparing to traditional technologies. In most cases, the ROI of the initial investment through savings is between 2 to 3 years.