NVIS Response Curves: There are two NVIS response curves. The Class A uses a 625 nm minus blue filter, which does not allow any red cockpit lighting. The Class B uses a 665 nm minus blue filter, which does allow the use of properly designed NVIS red lighting. Figure 14 shows the Class A and Class B relative response curves as compared to the photopic relative response curve.
Figure 14
PHOTOPIC, CLASS A NVIS AND CLASS B NVIS RELATIVE RESPONSE
NVIS Radiance: The NVIS compliant lighting meets the following MIL-L-85762A NVIS radiance requirements when set to the stated luminance levels.
Spectral Radiance, Type I Class A Colors: Figure 15 shows the normalized spectral radiance curves for the Type I Class A colors of NVIS blue, NVIS green A, NVIS green B, NVIS white and NVIS yellow Class A. Also shown are the relative photopic response and the relative spectral response of the Class A NVIS. These are the only colors that are allowed in a Class A cockpit.
Figure 15
NORMALIZED SPECTRAL RADIANCE FOR TYPE 1 CLASS A NVIS COLORS
Spectral Radiance, Type I Class B Colors: Figure 16 shows the normalized spectral radiance curves for the Type I Class A colors of NVIS blue, NVIS green A, NVIS green B, NVIS white and NVIS yellow Class A. Also shown are the relative photopic response and the relative spectral response of the Class A NVIS. These are the only colors that are allowed in a Class A cockpit.
Figure 16
NORMALIZED SPECTRAL RADIANCE FOR TYPE 1 CLASS A NVIS COLORS
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