Two possible matrix arrangements are presented below in detail: 4-element LED matrix with one peak wavelength
at 4.14 µm in 9 mm TO5 package with built-in thermoelectric module and a cap with sapphire window
3-element LED matrix with peak wavelengths at 1.6, 1.9, 2.2 µm in 9 mm
TO5 package with built-in thermoelectric module and a parabolic reflector with quartz window
