Philips is the first company in the industry to showcase the prototype of a 200lm/W warm white light. This LED technology breakthrough has pushed energy-efficient LED luminaires to a new level in general lighting applications. The 200lm/W LED is expected to be available in 2015 and will eventually be widely used.
Achieve the challenge of 200lm/W
To break through the 200 lm/W efficacy, the challenge is to achieve a high level of efficacy at the lamp/system level (showing end product prototypes under real and normal conditions and will be practical). Up to now, similar levels of light efficiency have been achieved in cool-coloured, controlled laboratory or appliance grades, but when placed in a luminaire, the efficacy is reduced by half. Moreover, to meet real-world applications, the light emitted by the LED must fall within a certain technical parameter. If the light color is too cold or too warm, or the red light is insufficient, it will affect the perception of color by the human eye and will cause the color of the object to deviate. For example, yellow/green light obtained by phosphor conversion is very efficient (over 380 lm/W), but is not practically suitable as a general lighting product.
In terms of technology, general lighting applications require a color temperature of 3000–4000 K, a CRI of at least 80, and an R9 (red saturation value) of no less than 20. Philips' TLED prototype has a luminous efficacy of 200 lm/W, but the color rendering is not degraded and coincides with the black body line.
How to emit white light?
There are two ways to make the LED emit white light. One is that multiple wavelengths of different LEDs have emitted white light (such as RGB), allowing the lighting designer to adjust the white light to a special color temperature.
The second is to use white indium gallium nitride (InGaN) LEDs and phosphor coating to emit white light, which is the more common white LED method.
However, Philips is now adopting a new approach: combining blue, green and red light with high quality white light.
At the heart of TLED is Philips Lumens' InGaN LED, which is hailed as the industry's highest performance blue LED. The LED's efficacy is significantly higher than the previous generation (used by Philips' L-winning 60W replacement lamp).
Major energy saving breakthrough
The LED innovation has great potential for energy saving, and lighting energy consumption is expected to be halved. Up to now, relatively energy-efficient fluorescent lamps (100 lm/W) have been found in office and industrial environments, but at the same time homes and shops require softer, warmer light from conventional bulbs (15 lm/W) or halogen lamps (25 lm/W). But Philips' 200lm/W LEDs go far beyond these three technologies.
Another benefit is that because the new LEDs generate less heat, there is no need for a heat sink. This means less footprint, more design flexibility, less material to use, and can be cheaper.
The prototype specifications: efficiency is 200 lm / W, CRI > 80, CCT is 4500-3000K, BBL R9 > 0.
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