White multichip LED for spotlights
10 July 2013
Opto-Electronics
Osram Ostar Stage LEDs from OSRAM Opto Semiconductors offer high luminance of 48 million candelas per square metre (Mcd/m²) and tuneable colour tones from cold white to warm white. Combined with their low-profile design and glass cover with its anti-reflective coating, they provide the basis for compact spotlights with an extremely narrow beam. They are ideal for use in moving head spotlights on stage, for booth lighting at trade fairs and for architectural lighting.
The special feature of the new LED is its tuneable white light colour. Two warm-white and two cold-white chips, arranged diagonally in the package, not only enable colours to be mixed at component level but also allow all white tones between colour temperatures of 2700 K (warm white) and 10 000 K (cold white) to be produced with appropriate control. The LED achieves a high colour rendering index of 94 for warm white and 74 for cold white.
Instead of the usual lens, the LEDs have a flat glass cover with an anti-reflective coating, making them ideal for injecting the light into lens systems. Its etendue (the emission angle/area ratio of the emitting light surface to the projected light surface) in conjunction with external optics is retained, enabling a very narrow beam of light (±9°) to be produced.
This beam is smaller by a factor of two than for spotlights based on plastic-encapsulated LEDs. Consequently, the luminance of the spotlight is greater by the same ratio.
Thanks to the glass cover, the Ostar Stage LED also has a much lower profile than previous standard components. At 1,23 mm, its height is only one quarter of the usual component height and its footprint is only 5,9 x 4,8 mm. Spotlights can therefore be made very compact.
All the versions of the Ostar Stage are based on the successful Ostar SMT platform and are suitable for standard solder processes. The chips are fabricated in state-of-the-art thin-film technology so that almost all the light produced internally is emitted at the top. The LED is therefore ideal for use with external optics.
In continuous operation (DC) the chips can handle an operating current of up to 900 mA. This gives maximum values of 390 lm in cold white (10 000 K) and 210 lm in warm white (2700 K). At a typical value of 1,8 K/W the thermal resistance is very low and heat removal is therefore simplified. In constant use the LEDs will last for more than 50 000 hours.
For more information contact Ryan Hunt, OSRAM Opto Semiconductors, +27 (0)79 525 1779, [email protected], www.osram-os.com
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