Osram Ostar Stage light-emitting diodes (LEDs) from Osram Opto Semiconductors offer the luminance of 48 million candelas per square metre (Mcd/m²) and tuneable colour tones from cold white to warm white. Combined with the company’s low-profile design and glass cover with anti-reflective coating, the Ostar Stage LEDs provide the basis for compact spotlights with a narrow beam. This LED is suitable 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° Kelvin (K) (warm white) and 10,000°K (cold white) to be produced with appropriate control. The LED achieves a 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 suitable for injecting the light into lens systems. Its “etendue” (i.e., the emission angle/area ratio of the emitting light surface to the projected light surface) in conjunction with external optics is retained, enabling a narrow beam of light (+/- 9°) to be produced. This beam is half the size of spotlights based on plastic-encapsulated LEDs. Consequently, the luminance of the spotlight is twice as great.
Thanks to the glass cover, the Osram Ostar Stage LED also has a much lower profile than previous standard components. At 1.23 millimetres (mm) its height is one-quarter of the usual component height and its footprint is 5.9mm × 4.8mm. Spotlights can therefore be made very compact.
The Osram Ostar Stage offers tuneable white from an LED for spotlights on stage and at trade fair booths. (Picture: Osram)
All the versions of the Osram Ostar Stage are based on the Osram Ostar SMT platform and are suitable for standard solder processes. The chips are fabricated in thin-film technology so that almost all the light produced internally is emitted at the top. The LED is therefore suitable for use with external optics. In continuous operation (direct current), the chips can handle an operating current of up to 900 milliamperes (mA). This gives maximum values of 390 lumen (lm) in cold white (10,000°K) and 210 lm in warm white (2700°K). At a value of 1.8°K/W, the thermal resistance is low and, according to the company, heat removal is not a problem. In constant use the LEDs will last for more than 50,000 hours, giving the moving heads and architectural fixtures a long life.
The LEDs can be used in spotlights of any size, from small stage spots to large moving heads. Osram will showcase the Osram Ostar Stage LED at Prolight + Sound 2013 on 10-13 April at the Messe Frankfurt (hall 9.0, stand D10) in Frankfurt, Germany. You can also find out about other new products there.
Photo 1: The Osram Ostar Stage LED (Picture: Osram)
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