With six thin-film chips and a hemispherical lens, the infrared Ostar Lighting LED from Osram Opto Semiconductors produces 3.5 W of optical output at an operating current of 1 A.
The beam angle and radiant intensity can be varied with standard secondary optics. The hexagonal honeycomb shape of this device enables multiple IR LEDs to be combined to form a large space-saving matrix so that the output power can be increased many times.
The LED is available in two wavelengths. At 850 nm, the SFH4750 is an optimised union of maximum spectral sensitivity for CCD and CMOS cameras with suppressed visibility for the human eye.
The SFH4751 has a wavelength of 940 nm, to which the human eye is almost insensitive. This model is used in applications where visibility of the light source must be eliminated.
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