Philips has introduced a white light solid state lighting fixture based around blue power LEDs from its Lumileds subsidiary.
Announced at Lightfair in Las Vegas this week, the fixture uses a separate phosphor plate to make white light rather than using traditional white LEDs.
"The Fortimo DLM 1100 uses 18 royal-blue Rebel LEDs and a remote phosphor lens at the top of a mixing chamber to create a white-light module delivering 1100 lm of light output with an efficiency of 62 lm/W," claimed Philips.
Why did Philips not use its own white power LEDs?
"There is no drawback to white Luxeon Rebels," Lumileds marketing director Steve Landau told EW. "The remote phosphor approach is an alternative way to generate white light. You can get a uniform high power source by using a cluster of blue LEDs and a phosphor screen. Discrete white LEDs could give a spotty appearance."
He added: "Also you can get a little better lm/W performance since less of the blue light is scattered from the phosphor back into the chip where it can be absorbed. The tradeoff is that you now have a larger source size."
The module is 44x82x83mm, and a second version delivers 2,000 lm at 45 lm/W. "Initially introduced with a 4,000K correlated colour temperature, the use of different remote phosphor lenses allows for the possibility of additional white options in the future," said Philips.
There is also a colour-tunable module: Lexel DLM-1000, again based around Rebel LEDs, which delivers 1000 lm adjustable between colour temperatures of 2,700K to 6,500K - with a claimed colour rendering index (CRI) of 80.
See www.philipslumileds.com