Osram Ostar Stage LED: flexible white for the stage

White multichip LED added to the spotlight range

Osram Ostar Stage LEDs from Osram Opto Semiconductors offer high luminance of 48 million candelas per square meter (Mcd/m²) and tunable color tones from cold white to warm white. Combined with their extremely low-profile design and glass cover with its anti-reflective coating, they provide the basis for compact spotlights with an extremely narrow beam. This LED is 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 tunable white light color. Two warm-white and two cold-white chips, arranged diagonally in the package, not only enable colors to be mixed perfectly at component level but also allow all white tones between color temperatures of 2700 Kelvin (K) (warm white) and 10,000 K (cold white) to be produced with appropriate control. The LED achieves a high color 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 factor 2 than for spotlights based on plastic-encapsulated LEDs. Consequently, the luminance of the spotlight is greater by factor 2.

Thanks to the glass cover the Osram Ostar Stage LED also has a much lower profile than previous standard components. At 1.23 millimeters (mm) its height is only one quarter of the usual component height and its footprint is only 5.9 mm x 4.8 mm. Spotlights can therefore be made very compact.

Surface emitters enable the light to be tightly focused

All the versions of the Osram Ostar Stage are based on the successful Osram 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 lumen (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 no problem at all. In constant use the LEDs will last for more than 50,000 hours, giving the moving heads and architectural fixtures a very long life.

Wide range of applications

The LEDs can be used in spotlights of any size, from small stage spots to large moving heads. Wolfgang Schnabel, LED Marketing Industrial Applications at Osram Opto Semiconductors, said: “Three versions of the Osram Ostar Stage LED are available, the Multi Color (RGBW), the pure white and now the tunable white. The range of applications is therefore now greater than ever before. With so many colors and configurations lamp designers have a virtually unlimited set of options.”

The company will be showcasing the Osram Ostar Stage LED at Prolight + Sound 2013 from April 10 to 13 in Frankfurt. Go to Hall 9.0, Stand D10. You can also find out about other new products there, such as the first LED spotlights from Osram for event and studio lighting.