Fire spell as carrier for archmage in poe2

Since archmage in poe2 is gain % damage as lightning per 100 mana, does that mean if I use a fire spell as archmage carrier ,%fire damage will benefit me more?

as main witch infernalist now, i hope we get archmage style for fire spells

No, it still follows conversion rules. In PoE2 when A is converted to B, modifiers to A have no effect.
This means you should scale lightning damage for Archmage.

But it's not conversion?Anywhere you can point me to read more?

https://www.mmojugg.com/news/path-of-exile-2-damage-conversion-overview.html


Also here stated gain % keep original damage type

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nickrei3#4248 wrote:

But it's not conversion?Anywhere you can point me to read more?

https://www.mmojugg.com/news/path-of-exile-2-damage-conversion-overview.html

It's "lossless" conversion (in PoE1 and PoE2). I don't have anything to recommend you read on that. But it's even covered in the article you provided

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Overview of Damage Conversion Types
In PoE2, damage conversion still comes in two primary forms, but they have different roles in how damage is transferred from one type to another:

Converted Modifiers: These modifiers transform a portion of one damage type (e.g., physical) into another (e.g., fire). When a portion of physical damage is converted to fire, for instance, that damage is no longer treated as physical, only fire.

Gained as Extra Modifiers: These modifiers allow one type of damage to “gain as extra” another type. For example, a character might gain an additional portion of physical damage as extra fire damage, without changing the original type.

These two forms of conversion only flow in a single direction and cannot loop back. For instance, physical damage can be converted into elemental damage (like fire or cold), but chaos damage cannot be converted into elemental types.

Note, the last paragraph is fasle in PoE2. You can convert chaos to elements, or gain % of chaos damage as lightning damage (with Archmage support for example). In fact, replacing of added flat damage to spells with "gain X as Y" became possible precisely because in PoE2 conversion works in any direction (or rather, there's no direction at all).

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nickrei3#4248 wrote:

Also here stated gain % keep original damage type

Yes, it keeps the original damage. Say, Fireball has 100 base (listed on the gem) fire damage. You have 20% increased fire damage, 10% increased lightning damage and 600 mana (so Archmage level 14 gives you 30% of damage as lightning damage).
In this case your Fireball deals:
- 120 fire damage (100 base * 20% increased fire damage)
- 33 lightning damage (30 from Archmage * 10% increased lightning damage).
Archmage gains 30% of 100 base damage, not of 120 modified damage.