If you have the luxury of a second crewmember on the same side of the aircraft as the pilot, you may wish to consider using a Dragonlight handheld high-power torch with IR Filter instead of SX16. The Dragonlight is far more easily controlled and responsive when compared to an aircraft-mounted, joystick-steered light. Main disadvantage is that for illuminating targets further forward than the 2 o'clock (assuming the operator is on the RHS) the AS needs to be below 60 kts to enable the man with the light to hold it steady in the airflow. My RAF Chinook experience finished in '98, but this was certainly the system in use then, and also what was taught in Brunei from 98 to 01.
Be aware that there appear to be 2 different thicknesses/densities of Dragonlight IR filter, both with the same part number; the UK-forces issue version gave an excellent light source, whereas the type initially bought by the Brunes was so opaque as to be useless.
No-one seems to have raised the topic of diffuse-light sources; the type used by the UK (Brightstar) on a fixed mounting underneath the fuselage give invaluable reference info without the high contrast problems of IR or white-light searchlights. Very handy on OVC Borneo nights over the ulu...