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Small power packs make a big impression

Osram's new Ostar Stage LEDs have a flat glass window with an anti-reflective coating, giving the LED a much flatter profile. At a quarter of the usual height, the LEDs enable much more compact spotlights

 With their much flatter profile the new Osram Ostar Stage LEDs provide the basis for compact spotlights with an extremely narrow beam and high luminance.

These LEDs are ideal for moveable stage lights, known as moving heads, which provide powerful light beams for rock concerts and other impressive lighting arrangements.



The new Osram Ostar Stage LEDs for bright spotlighting with colour mixing

Instead of the usual lens, Osram Ostar Stage LEDs have a flat glass cover with an anti-reflective coating, giving the LED a much flatter profile. At only 1.23 mm, a quarter of the usual height, spotlights can be made much more compact.

The glass cover on the new LEDs has been optimised 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 customer optics enables a very narrow beam of light (+/- 9°) to be produced. This beam is twice as small as those used in spotlights based on plastic-encapsulated LEDs. This optimum bundling of light increases the luminance of the spotlight by a factor of two.

These powerful light sources are based on the successful Osram Ostar SMT platform. They contain four different chips in red, green, blue and white and Osram says they can produce virtually any colour. All four chips are manufactured using efficient thin- film technology so that almost all the light produced internally is emitted at the top and more light can be focused in the customer optics system. In pulse mode, the individual chips can be operated at a current of up to 2 A, and up to 1 A in continuous mode.

This gives maximum values of 146 lumen (lm) in red, 234 lm in green, 1.3 W in blue and 286 lm in white. The overall brightness of an LED at a typical output of 10 W could be up to 700 lm.

The LEDs have a compact footprint of only 5.9 mm x 4.8 mm x 1.23 mm. At 3.1 K/W the thermal resistance is very low and Osram says that heat removal is "no problem at all". In constant use, the LEDs will last for more than 50,000 hours, giving the moving heads a very long life. What's more, the LEDs can be used in spotlights of any size, from small stage spots to large moving heads.

With a beam angle of 120°, the wavelengths of the LEDs are 625 nm for red, 527 nm for green and 455 nm for blue. The colour temperature of the white LED is 6500 K and the operating current in pulse mode for each colour is 1 A.

Volker Mertens, LED Marketing Manager at Osram Opto explains, “Osram Ostar Stage has a wide range of applications with different colours and configurations – a real treat for lamp designers. More colour combinations are in the pipeline for the Ostar platform. By mixing the different Osram Ostar types it is possible to create an enormous range of colours, including pastel shades.”
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