Products

25 Watt

Overview “Tiltable Downlights”

Background

Tiltable and non- tiltible rectangular downlights used largely in retail stores/ offices have been a challenge to make more efficient.  These lights typically use 150 Watt HPS lights which not only use a lot of power but also have a bad power factor thus increasing costs.

Elexpert has developed an attractive  more efficient solution to this challenge.  These lights can also be provided with a backup.  This paper described the features thereof.

Retrofit

The idea of the retrofit is the following:

  • The old power supply and starter be removed.
  • The old globe be removed as well as the reflector.
  • The new driver be installed and 230V power connected.
  • Connect battery backup if required.
  • The LED light then be installed with 2 screws into the existing threads.
  • Connect the Pos & Neg wires to the light.
  • Return glass and tilt to required position.

The attractive feature of this is that no extensive construction work is required and the existing fittings can be used.

New light design

The basic idea of the retrofit LED tiltible downlight is as follows.

  • A constant current power driver.
  • The basic light unit which include:
    • 4 CREE LED’s
    • PC board
    • Ledil 2×2 lenses
    • Heat sink
    • Thermoswitch
    • 12 volt fan

The whole idea is that the driver and light are modular.  If any of these fail it can be replaced under guarantee and only the faulty component be repaired.

Features of the light

The features of the new light can be summarised as follows:

  • Much more efficient use of electricity to provide the light. (70% saving)
  • Lower heat generation thereby increasing comfort or decreasing air conditioning costs.
  • Easy change of components.
  • Immediate light, not 10 minute waiting period.
  • Only 10% failure expected in more than 50 000 hours.
  • Excellent power factor.
  • Automatic standby if selection.

 

 

The following will happen with light problems:

  • If the light or driver fails there will be immediate loss of light.
  • If the fan fails the thermo switch will cut supply when overheating.
  • Once the LED is cool, the LED will switch on again.
  • Such switching on and off will thus indicate a faulty fan.

The following will happen with backup option.

  • When the mains power fails, the standby mode will apply.
  • The light intensity will be reduced.
  • The standby supply will remain on until battery runs flat.

Light intensity

The 40 Watt LED light provides slightly less lumens that the 150 Watt HPS light but it is better focussed in the 30 degree vertical plane and 120 degree horizontal plane.  This will enable good focus on the target area with least wasted light.

The comparative light spectrum for different lights are compared in the figure below:

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It is clear that the LED’s lights can provide the similar light as the HPS lights in the target area with much lower power.

Warrantee

The light contains the following separate parts namely:

  • The power supply.
  • The LED light unit.
  • The backup supply control unit and battery (optional).

All these units will carry a 2 year on site exchange warrantee.  The customer will change any faulty units. If any of the units fault after the warrantee period, the same process will apply except that a fee will be charged to collect / install / replace / repair the faulty components.  It is important to note that only the faulty components will be replaced and be charged for.

Life expectancy

The life expectancy of the various key components of the product are as follows:

  • The Power supply. – 10 years continuous.
  • The fan. – 10 years continuous.
  • LEDs. – 5 years continuous.
  • Backup control unit (optional). – 10 years continuous.
  • Battery (optional). – 2 years.

Lumen maintenance Lifetime.  The output of LED do reduce over time.  This is largely depending in the temperature of the LED.  The solution provided here will retain a surface temperature of less than 75° C.  This indicates that 80% light will be retained after 50 000 hours of continuous operation.

Break even

The expected breakeven for the application in a typical store is shown in the table below:

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The impact for every customer will be different and therefore a study has to be done for each customer individually.  In the example the breakeven will be in less than 18 months after which significant profits will be achieved.

Contact

Please call to arrange the following:

  • A study of current light layout, light requirements / problems and other needs.
  • A pilot to test the light in your environment.
  • Quote to your requirements.