All 4 Uses

luminous
in
Like Water for Chocolate
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Naked as she was, with her loosened hair falling to her waist, luminous, glowing with energy, she might have been an angel and devil in one woman.†
Chpt 3
Using this method, he obtained a luminous substance that burned with an intensity such as had never been seen before.
Chpt 6 *

luminous = glowing
Surely Pedro had died at the moment of ecstasy when he entered the luminous tunnel.†
Chpt 12
There at its entrance was the luminous figure of Pedro waiting for her.†
Chpt 12

Definitions:

(1) (luminous)
glowing or shining

(also used metaphorically to describe beauty or intelligence)
(2) (meaning too rare to warrant focus)
Much more rarely, luminous can mean beautiful, inspiring, or beautifully clear and understandable.