Unwelcome Halo vs magical Darkness

[Matt2VK]

Spell, 1st level Cleric (found in Inner Sea Gods pg 244)

Unwelcome Halo
This spell causes the target to glow as if surrounded by a halo of light. This halo sheds normal light in a 20-foot radius from the creature, and increases the light level by one step for an additional 20 feet. This halo makes it impossible for the creature to gain concealment in nonmagical darkness, and in dim or darker conditions, the creature’s glow can be seen even if it is not within direct line of sight.

If unwelcome halo is brought into an area of magical darkness (or vice versa), the effects of both spells are temporarily negated, so that the otherwise prevailing light conditions exist within the overlapping fields of effect.

What I'm interested in is bolded.

Here's how I want to use this spell -

Nasty creature hits party with magical darkness. I then cast Unwelcome Halo on a party member.

If I understand this spell correctly, that magical Darkness, no matter what spell level it is, will go *I'm Temporarily Negated!* overwritten and the party will then be in ambient light.

I'm also assuming that the light condition will stay at the ambient light till either the Magical Darkness is over-written by a higher light spell or the duration of the Magical Darkness or Unwelcome Halo spell expire.

Is this tactic legal by RAW (for PFS)?

[Sibelle]

I would really like to understand the interaction as well. The wording on Unwelcome Halo and Daylight/Light/Darkness/Deeper Darkness are not the same. Does that mean Unwelcome Halo temporarily negates even Deeper Darkness?

[BigNorseWolf]

Yes. It is a major screwup. Its intended to be a debuff on a rogue instead its a cheap short Daylight spell because it uses the same language.

[pauljathome]

The spell is very clearly very broken (it is way too powerful for a first level spell and it seems to be an example of a spell intended as a debuff which is actually MUCH better as a buff) but, as written, it trumps darkness and greater darkness.

Up here we seem to have a gentlepersons agreement to not use it. A (fairly weak, admittedly) argument could be made that using it as a buff spell is a jerk move.