The light level sensor and transmitter is to be used for applications such as turning on or off indoor or outdoor lighting based upon the amount of available light. These sensors are not to be used in applications such as green houses where the actual amount of light is monitored. The sensor is mounted in a NEMA 3R rated enclosure and has a resistance in darkness in excess of 1M ohms versus a resistance in bright light of less than 1.5K ohms. The A/LLS-T incorporates a transmitter with the sensor to produce a non-linear 4-20 mA output signal. The A/LLS-T is calibrated for 4 mA in darkness and 20 mA in bright light.  The A/LLS is covered by ACI's Five (5) Year Limited Warranty.