Can we detect it on exoplanets?

No. If it's barely detectable right next to the organism, it's extremely below the noise level on a planetary scale.

What if we got 8 billion people to all jump, er, bio-luminate at once?

	▲	viraptor 3 days ago \| parent [-]
		You'd still get less than 1 cd of luminance in total, unless my napkin math is way off.