LED lighting produces warm white at 200 lm/W from tube lamps

April 11, 2013 // By Graham Prophet
Philips Electronics has developed an LED lighting technique that the company claims as the world’s most energy-efficient LED lamp suitable for general lighting applications. Philips researchers developed a tube lighting (TL) replacement TLED prototype that produces a record 200 lumens per watt of high-quality white light (compared with 100lm/W for fluorescent lighting and just 15lm/W for traditional light bulbs).

This prototype TLED lamp is twice as efficient as predecessor lamps, basically halving the energy used. With lighting accounting for more than 19% of the world’s total electricity consumption, this innovation promises to drive massive energy and cost savings across the globe. The 200 lm/W TLED lamp is expected to come to the market in 2015 for office and industry applications before ultimately being used in the home.

This is the first time that lighting engineers have been able to reach 200lm/W efficiency without compromising on light quality, with all parameters required to meet the stringent requirements for office lighting. Rene van Schooten, CEO Light Sources & Electronics for Philips Lighting, says, “After being recognised for our quality of LED light (mimicking traditional light bulbs) to creating new experience with Philips Hue (the connected light system for the home), we now present the next innovative step in doubling lighting efficiency.” The TLED lamps are intended to replace fluorescent tube lighting used in office and industry, which currently account for more than half of the world’s total lighting. Conversion to the twice-as-efficient 200lm/W TLED lamps will generate significant energy and cost savings.

In the industry’s effort to break the 200 lm/W barrier, the challenge is to achieve higher efficiency levels at lamp/system level (demonstrated in an end product prototype under real, normal conditions and ready to be incorporated into actual products). Until now, similar efficiency levels have been achieved in a cool and controlled lab setting or on component level, however, when placing the solution in a lamp it could lose up to 50% of its efficiency. Furthermore, to be suitable for real-world applications, the light produced by LEDs must fall within certain technical parameters. If it is too cool or too warm in colour, or lacks a sufficient quantity of red, it will interfere with the way the human eye perceives colour, and will give objects an unnatural tint. Yellow/green