A quick search here for “moonlight dual-channel” ( or replicated on google ) revealed this post by ToyKeeper detailing the hardware reasons why.
You might be interested in this experimental extra low moonlight mode
When enabled, moonlight mode sets the light to the lowest available brightness, then enters low-power standby mode (as if the light was off) while leaving the LED channel enabled.
For dual-channel lights, this produces a brightness level per-LED similar to single-channel lights, though it’s flickery and variable. Brightness will drop with battery level, and will stop working entirely at some point. Results will vary by emitter.