In normal daylight conditions our eyes predominately see green/yellow light.
In near complete darkness our eyes become more sensitive to blue/ultraviolet light.
The systems shown below enhance that change in our vision by emitting blue and ultraviolet light.
The systems can also pulse or strobe the light at a selectable frequency or sweep through varying frequencies on a repeating cycle.

Why you ask? Strobed or pulsed light can freeze high speed movement when the correct frequency is found, just as a drop of water can be seen from a running tap when a strobe light is shone at the flow.

This unit is one of several new 'enhanced human night vision' systems.
It uses blue and ultraviolet LEDs to enhance our vision in low light conditions.
Our eyes are able to see more in the blue/ultraviolet light region after becoming conditioned to darkness.

The switches allow the selection of various modes:-

1, The LEDs can be on continually,

2, Sweep/pulse mode -
The LEDs are pulsing alternately where only one colour is on at any one time.
The pulsing frequency automatically sweeps from 49hz to 695hz (slow)
545hz to 8khz (fast), the sweep continually recycles.

3, Manual selection of frequency, from 1hz to 876hz (slow) to 14hz to 10khz (fast)

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This new 'enhanced human night vision' system contains 5 colours, red, green, blue, ultraviolet and white,
All the colours can be individually selected and flash together.

The switches allow the selection of various modes:-

1, The LEDs can be on continually,

2, Sweep/pulse mode -
The pulsing frequency automatically sweeps from 49hz to 695hz (slow)
545hz to 8khz (fast), the sweep continually recycles.

3, Manual selection of frequency, from 1hz to 1.4hz (slow) to 12hz to 15.2khz (fast)