3), as Vasupati, or 'lord of the Vasus.' He goes with many forms (vi.47.

18).[7] The luminous character[8] of Indra, which has caused him to be identified with light-gods, can be understood only when one remembers that in India the rainy season is ushered in by such displays of lightning that the heavens are often illuminated in every direction at once; and not with a succession of flashes, but with contemporaneous ubiquitous sheets of light, so that it appears as if on all sides of the sky there was one lining of united dazzling flame.

When it is said that Indra 'placed light in light,' one is not to understand, with Bergaigne, that Indra is identical with the sun, but that in day (light) Indra puts lightning (x.54.

6; Bergaigne ii.p.

187).
Since Indra's lightning[9] is a form of fire, there is found in this union the first mystic dualism of two distinct gods as one.