We present the design and measured performance of an LED module for spatially mapping kinetic inductance detector arrays in the laboratory. Our novel approach uses a multiplexing (MUX) scheme that only requires seven wires to control 480 red LEDs, and the number of LEDs can be scaled up without adding any additional wires. This multiplexing approach relies on active surface mount components that can operate at cryogenic temperatures down to 10 K. Cryogenic tests in liquid nitrogen and inside our cryostat demonstrate that the MUX circuit works at 77 K and 10 K, respectively. The LED module presented here is tailored for millimeter-wave detector modules we are developing, but the approach could be broadly useful for other KID-based detector systems.
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