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Modified from I. Cerda Thesis: 

The visible light relay assembly is made of a 20”-long 2-conductor cable running between the Power Distribution Board’s 12 V and GND rails to a 5V relay board’s NO and COM pins set to low trigger (Tongling). The removal of a 5V digital input coming from the Labjack T7 during the transition from the 12 night-hours to the 12 day-hours completes the circuit and turns on a constant lux warm yellow LED strip to simulate natural sunlight conditions. The NO pin of the relay board and the positive lead of the 3.5”-long LED strip are connected via a female-male barrel jack junction.

Connections:

Pin
Connection
Visible Light Relay - "DC+"
Data Collection Assembly (Labjack) - "VS"
Visible Light Relay - "DC-"
Data Collection Assembly (Labjack) - "GND"
Visible Light Relay - "IN"
Data Collection Assembly (Labjack) - "CIO1"