I noticed that when running both Striking Light and Heavy Handed mods, Striking Light will not proc at all. It doesn't matter if you use a charged melee ability or a melee basic attack to kill an enemy. I was using Stormcaller and running these mods:
[quote]Elemental Ordinance
Elemental Charge
Striking Light
Heavy Handed[/quote]
With the Charged with Light x2 that I get from the elemental well, I thought that getting a charged melee kill would proc both Striking Light and Heavy Handed, but only Heavy Handed proc'd. With the charged ability on cooldown, I thought I might still be able to proc Striking Light with a basic melee attack, but that didn't work either.
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So I went and did more testing just to make sure, and it turns out Stormcaller melees work fine. However, Tempest Strike (middle tree Arcstrider melee) doesn't proc heavy handed and neither does Shivering Strike (behemoth, but everyone knows that already). In short, all classes and subclasses work as expected except for Way of Current's tempest strike and Behemoth's Shivering Strike