Damage gain calculation

if I have 10-100 lightning damage, and gain 100% of damage as extra fire, what happens when I hit an enemy?

- lightning damage is rolled between 10-100, and the same amount is also dealt as fire? (one roll)
- lightning damage is rolled between 10-100, and fire damage is also rolled between 10-100, which means they can hit for different amounts? (two rolls)

if it's 1, how does this interact with the lightning rod notable? does the fire portion also become lucky as a result?

This shouldn't be different from PoE1. Conversion applies to the range, damage roll happens when hit damage is calculating.

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auspexa#1404 wrote:

which means they can hit for different amounts? (two rolls)

Yes.