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LED Lighting To Finally Become Cost Effective

Thursday 2nd June 2011

LED Lighting

10 years ago, LED Lighting was set to revolutionise the general illumination market. LEDs, also known as Light Emitting Diodes, had already taken over are the role as indicator panel illuminators and user interfaces on industrial, commercial and consumer products. All the trend lines indicated that they would eclipse the incandescent light globe for cost per watt within a decade.

So what went wrong?

Purple LED Diffused

LED Lighting – Purple LED Diffused

More power without more light

As the technology was scaled up, the power levels rose and the expected requirements of more heatsinking were being dealt with and all seemed on track for LEDs to take over the world of lighting. But then a snag was hit. The technology got to a point where the efficiency dropped off as more current flowed through the diode. Companies like CREE, LumiLEDs and OSRAM pursued different and moderately successful strategies to try and overcome these limitations but the pace of progress slowed dramatically.

All of this points to a technical barrier we still don’t fully understand but are chipping away at.

 

Same light less cost

The other issue is the cost per watt in terms of the manufacturing cost of LEDs. The manufacturing process typically uses Sapphire or Silicon Carbide substrated which makes LEDs more expensive to manufacture than conventional semiconductors. There are several ways to improve this and they are all being pursued in parallel.

The first is the move toward organic semiconductors as covered in my recent post on Printed Electronics I looked at much lower cost techniques for making semiconductors and organic LEDs are one of the possible end products from these techniques. The CSIRO are world leaders in these technologies and are actively pursuing research into flexible electronics including organic displays and lighting. Here the challenge is creating a robust manufacturing technique that produces high volume, low cost lighting. The efficiency may not be as high but the cost per watt is much lower. Organic Semiconductors and organic LEDs will continue to be part of the solution. You can read about their efforts in CSIRO Flexible Electronics.

CSIRO Flexible Electronics

CSIRO Flexible Electronics

The second move is toward reducing the costs of conventional LED manufacture by eliminating the more costly steps of the process. A recent breakthrough was announced by Bridgelux and reportied in IEEE Spectrum will permit the manufacture of LEDs on silicon substrates. In Silicon Is Key to Quest for $5 LED Lightbulb the breakthrough is described and the promise is good. This also does not address the efficiency problem but again reduces the cost per watt.

Bridgelux Silicon Substrate LED

Bridgelux Silicon Substrate LED

Efficiency is the final frontier

The final chapter is yet to be written because the breakthrough we have all hoped for has not yet arrived. In the meantime the problem is being tackled from many sides and advances are being made on multiple technical fronts. LED lighting is an important part of the strategy to reduce our Carbon Footprint.

 

Ray Keefe has been developing high quality and market leading electronics products in Australia for nearly 30 years. For more information go to his LinkedIn profile at Ray Keefe. This post is Copyright © 2011 Successful Endeavours Pty Ltd.

One thought on “LED Lighting To Finally Become Cost Effective

  1. It would be wonderful if Led lighting could become more cost effective. my Parents recently moved house. The previous owners had done a lot of renovation work. They had installed 16 downlights in the family, dining kitchen area. Although these are on seperate switches (4×3 and 1×4) each lamp burns about 50w. They limited usage by using a tall lamp with a energy saving globe when not using the kitchen area. They costed changing over the whole system to Led lights but were shocked to find out they were around $35.00 each plus installing. probably around $1000 all up. They would love to change over to the Led lighting so much appreciate your efforts to reduce costs.

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