LED targets covert surveillance

The infrared Oslon black SFH 4725S LED has a wavelength of 940 nm, making it nearly invisible to the human eye. Together with its optical output power of almost 1 W it suits covert surveillance applications. Its black package reflects virtually no ambient light.

The infrared LED provides 940-nm light and has an optical output of 980 mW from an operating current of 1 A. It also provides two emission centers on one chip, almost doubling the light output. The typical 850-nm LEDs used for covert applications appear as weak dots of red light. The human eye is 130 times less likely to notice 940 nm infrared light but camera sensors can detect this wavelength. The LED achieves a radiant intensity of 450 mW/steradian at an emission angle of 90 degrees. It measures 3.85 x 3.85 x 2.29-mm. (Contact company for price and availability.)

By Paul O’Shea