Wreath of Phrecia and Righteous Fire Interaction?

I was curious about this as I found this helm in SSF at an early level so I started looking around to see what my google-fu could uncover. Every post says it doesn't have any effect at all. I couldn't find a single RF resource that says otherwise, anywhere.

So, being as stubborn as I am I decided to doubt the world and do my own minor round of simple testing with just the helm that dropped for me. As far as I can tell the helm DOES in fact apply its damage modifier based on the light radius increase. The helm that dropped for me has a 21% increase and half of that (for the damage calculation) of 10.5%. I compared my new tooltip damage with my original damage over the new number and it was indeed 90%, i.e. a 10% increase based on the new total. It didn't appear to impact the radius at all but at such an insignificant number it may simply not be apparent visually. Am I wrong and seeing a fake tooltip in-game that shows an increase in the DPS of RF?

If it is in fact adding to RF damage could that be leveraged enough that it would be an efficient way to improve RF damage overall? It would, if nothing else, also apply to Fire Trap as a secondary benefit of course. Granted a mere 10% isn't a big deal but the real question becomes; is it possible to bump that up without sacrificing other damage sources?

Okay, down the road a bit further I grabbed a couple rings, each with 15% increased light radius and either everyone was wrong or its been changed.

As of 3.27 the Wreath of Phrecia does in fact cause light increases to affect both the radius and damage of Righteous Fire.

Looking into light area increases I believe it can be optimized at over 300%. Theoretically, if it doesn't impact other sources, that would be a 300% area increase and 150% damage increase. Might be worth swapping out other damage sources if it is an overall increase.

Apologies for the error; area of effect is at 50% and damage is at 100% so its roughly 150% area increase and 300% damage increase. My bad.

It may be good for levelling, but that's about it.

No life, no reservation efficiency, no defenses, no resistances, etc. Furthermore, you have to scale with such a niche stat that it's simply not worth it. Not sure where you're getting 300% increase; there's 40% on skill tree if you go ES, 25% from helm, and if you dual wield Nycta's Lantern you get 50%x2 for a total of 100% base + 165% added.

Any decent fire multi weapon will far outperform any benefit from that.