i think luminous means when something gives off light and non-luminous means when something does not give off light.
Non-luminous means that is doesn't have a glow/light to it.
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Luminous objects usually give out the light that they make on their own. An example of a luminous object is a star or an LED lamp.
a supernova is an stellar explosion extremely luminouse and cause a bright radiation. I recommend for you to understand the supernova the link provided in the related links box below.
A Supernova core has an temperature of about 100 billion kelvin (100 GK); 6000 times the temperature of the sun's core.Supernovae are extremely bright and cause a burst of radiation that can briefly outshine an entire galaxy.During this short interval, a supernova can radiate as much energy as the Sun would produce over its entire life span.Some supernova are reported to have temperatures > 50 million degrees F