You could red-wire your lamp directly to the chest, and set it to light on only if the contents are below the threshold
You would lose the red/green indicator, and only retain a lamp on / lamp off information, but that would require no combinators at all

Even better, you could connect the lamp ...

One thing no one is talking about are those cliff-sized alien walls in some areas. They were clearly built by someone. I wonder if a tech coming from this planet is walls 2.0 that are basically buildable cliffs: larger and thicker segments (maybe 2x2 or 3x3) that are damn near indestructible ...