The APLS begun its life as a passive light sensor, it has developed into the device described below.

Due to the wide variability of the sensitivity controls the APLS is not calibrated in light measurement units, it is designed to detect and indicate relative changes, it is designed to be adaptable to various uses.
The APLS will pick up and indicate relative intensity of light from several sources, daylight, bulb and fluorescent Infra-red and laser lighting.

Passive light detector
The ALPS can be used as a portable walk around light sensor or as a stationary monitor.
The APLS has an LED display that reacts as the intensity of light increases on the light sensor, the illuminated LED display moves to the right relative to the intensity of light.
The APLS also contains an audio tone generator that reacts relative to the light intensity.

Active light emitter and detector (short range)
The system incorporates two switchable types of LED emitters - two infra red LED's and two ultraviolet LED's.
The LEDs can be individually selected at the users discretion to suit a location and investigate type.
The LED's are 'pulse modulated' at a harmonic of there light frequency - the light vibrates. This feature provides a new lighting potential.
The frequency for each LED type is at its own harmonic frequency and is pulsed at approximately 2 hertz.

The APLS has a switch-able low and high sensitivity range and a variable sensitivity control to allow a greater range of experimental procedures and to suit various locations.

The infrared emitters are more powerful than the ultraviolet LED's and give a greater range for reflective responses, they more suitable when working in a location requiring complete darkness. They can create limited illumination for most 0 Lux 'night shot' camcorders.

The ultraviolet LED's are suited as a human observation tool in low light locations, our eyes can see limited amounts of ultraviolet light, if within range anything that can reflect ultraviolet light will be indicated by the APLS.

When the built-in pulse driven LED emitters are selected any object capable of reflecting light within the range if the sensor, will cause a pulsed movement on the LED display and if the tone generator volume is turned on a pulsing sound will be heard.

The audio level is relatively low, a high output amplifier and could be installed as an optional extra, a 3.5mm socket could also be added as an optional extra to monitor and triggered response from a remote location.

The APLS can also be used to monitor the intensity of a low level laser beam (not supplied) over great distance or with the aid of mirrors (not supplied) the perimeter of a room or large space. Advice can be supplied.

The APLS is new and experimental it allows new opportunities, experimental procedures and potential.
Feedback of results will help with future research and development