an inexpensive infrared illumination for hobbyists

A toy I can not see it. Have so an infrared lighting for video surveillance an observatory realized. The infrared light does not interfere with the visual observation nor nocturnal astrophotography with normal digital cameras. The low angle of radiation can be much larger with a Steuscheibe in 4cm distance before the block. With 2 video cameras type Watec502 and 2 such infrared headlight modules, I achieve a sufficient illuminance in 4m distance from the lamp. The cameras are equipped with wide-angle lenses of 4mm focal length, corresponding to an angle of about 90 °.