NIGHTSEA infrared light head and dimmer

Infrared light sources are used for non-intrusive observation of behaviour and are ideal for use with small subjects. The NIGHTSEA infrared light head and dimmer is an 850nm light source that is compatible with the NIGHTSEA Model SFA Stereo Microscope Fluorescence Adapter. The light head plugs directly into the lamp base supplied with the SFA system. You can acquire the light head as a supplement to the SFA system that you already own for fluorescence observation, or you can acquire it in combination with a lamp base as a stand-alone device.

The light head incorporates a high power 850nm LED and a medium beam width diffusing lens to create a smooth illumination area. The output is centred at 850nm with a FWHM (full width at half maximum) of approximately 50nm. There is virtually no emission at wavelengths shorter than 750nm. Figure 3 below shows a test target with circles of 2, 5, and 10cm diameter. This photograph was taken with a conventional camera under normal room light, and with the IR light head illuminated at full power, directed at the target centre from a distance of approximately 10cm (4 in.). The illumination spot is not visible either to this camera or to the naked eye. Figure 4 is a photograph made under the same lighting conditions, but with a camera that had been modified to image only infrared light. Use the DIM base with infrared light head gives finer control of illumination intensity.