So I am just rolling around the idea of a character in my head and I am thinking of an Aasimar White Mage Arcanist.
One of the things that I am interested in is the bonuses that they can get to Light spells. Angelic Flesh with the Golden can give them +1 CL to [Light] spells and they have an Alternate Racial Trait called Heavenborn that can give them another +1 CL to [Light] spells.
The problem is there are not a lot of good Light spells. Most of them are situationally useful and few actually even do damage. Is there any way to give a spell the [Light] descriptor? Is there some other way to make a spell without the [Light] descriptor take advantage of those abilities?
Flaring Spell is a fairly weak Metamagic Feat but it would interest me for a build like this. That is... it would interest me if many [Light] spells didn't already dazzle their targets. Consecrate Spell is a fairly powerful Metamagic Feat that would also interest me for a build like this. The problem, however, is that neither of these make the spell a [Light] spell.
So it sounds as if [Light] spells just kinda... suck.
Without any way of giving existing spells the [Light] descriptor I am actually not seeing much benefit to increasing caster level for [Light] spells.
Unless I'm missing something, I'm just not seeing them worth investing in. At all.
Continual Flame 2
Dancing Lights 0
Daylight 3
Flare 0
Light 0
Sunburst 8
That's all I see in the hardcovers for light descriptor spells. Here they are with the wizard levels. Half of the light spells are cantrips. One 2nd, one 3rd and then an 8th. Not a lot of option there.
Now, maybe there is a way you could make spells get the light descriptor?
Burst of Radiance from Champions of Purity is an effective low-level offensive spell with the [Light] descriptor.