LED Lighting

Solid State Lighting (SSL) technology – also known as LEDs, or light emitting diodes, holds considerable promise to substantially increase energy efficiency across a range of lighting applications.

Electricity is passed through a semiconductor chip which when switched on, allows for the flow of charge to release energy in the form of photons, or light. The colour emitted depends on the materials used to make the LED. They can be red, yellow, blue, green or "white".

LEDs can produce more useable white light per unit of energy than metal halide, sodium vapour, fluorescent and halogen light sources. In addition, LEDs produce a lot of light from a very small source, which helps to control the light output. Optical control is crucial to proper illumination and LEDs lend themselves to be better equipped to fit the needs of the lighting application. Careful optical design for LED luminaries maximizes illumination to desired areas with less light “spill-off.”

Ever-increasing expenditure on R&D in the field will ensure that product diversity and quality continue to improve for many years.

Measuring LED light quality

The rapid growth of LED lighting has resulted in an increasing number of new products on the Australian market, including a proportion of under-performing product that does not live up to its supplier’s claims. Such poor performing product can undermine confidence among users and discourage early adopters of the technology.

enLighten has a strong commitment to quality & only uses high performing single bin LUXEON LED components, supplied by Phillips Lumiled.

We encourage potential customers to be discerning and to understand the following key parameters of product quality:

Luminaire efficacy

Luminaire Efficacy (lumens per Watt) is a specific measure of the net useful light output from the luminaire for a given power input. Properly measured, luminaire efficacy combines both the light source system efficacy and luminaire efficiency, allowing for a true comparison of a luminaire regardless of the light source. Luminaire efficacy is the preferred metric for LEDs because it measures the net light output from the luminaire divided by power into the system, accounting for driver, optical and thermal losses. A photometric report is required from an accredited laboratory.

Luminaire light output

Light output of luminaire is the total lumens output by a luminaire (as a whole). For LED products, luminaire light output must be determined by measuring the output of the entire luminaire (including the LED device, thermal management, device driver losses, fixture, and optics) in an integrating sphere or goniophotometer using absolute photometry.

Measured input power

Measured Power is the total power consumed by a luminaire measured in Watts. In all cases, the luminaire power should be measured upstream of power supply/driver.

Correlated colour temperature

The colour appearance of the light source is represented by the correlated colour temperature (CCT), for which the unit of measurement is Kelvin (K). The higher the CCT the "cooler" or blue the light is. 2500 K has a very warm or yellow appearance whereas 5000K is a cool white light, common in office areas.

Colour rendering index

Light sources can appear similar in colour but may render or "show" the surface colour quite differently. Colour Rendering Index (CRI) is the ability to render colour and is measured in numbers.

Product quality

The correct design of luminaires is critical to achieve an optimal lamp life & light output quality.

Heat sinks

LED lights generate very little heat when compared to other light sources. The ability of a heat sink to extract the heat at the LED junction point is critical to support a long product life. Heat sinks are typically aluminium fins to promote air flow that sit behind the luminaire.

Smart Optics

The LED light should be fitted with optical devices such as lenses that will deliver light where it is needed. The light distribution and optical efficiency benefits of high quality lenses can deliver up to 25% improvement.

Smart control

The next generation of LED luminaires will be pre-fitted with smart controls - microwave, radio frequency or passive infra-red (PIR) sensing. Control options take into account natural daylight, occupancy & activity levels to allow for more flexible light delivery.

Further reference

Why choose LEDs

LED FAQs

Lighting Council of Australia

Phillips Lumiled

Energy efficient lighting technology report - July 2012. NSW Office of Environment & Heritage Energy Saver program

Lighting technologies extract from Beyond Zero Emissions' June 2013 Zero Carbon Australia Buildings Plan,

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