[tata71]

Not my industry, but:

Isn't the green for "not so serious" framing, and "not recording",

with red being "recording"?

[aastronaut]

you are referring to the "tally light", which uses a very limited range of values, usually 2 (off/red) or 3 (off/red/green) in a studio setting. since this here is a continuous value (based on multiple parameters) i would also think in terms of green being desirable and red being non-desirable.

[jaclaz]

As said above, it depends, battery indicators (usually) are:

green=OK

red=no good

yellow=so and so