I suppose it doesn't need to be Swift if it has this longer duration.
[sblock=Current Version]
Light of the North Tower
Evocation [Light]
Level: Clr 1, Sor/Wiz 2
Components: V, S
Casting Time: 1 standard action
Range: 0 ft.
Effect: Light in your palm
Duration: 1 min./level (D)
Saving Throw: None
Spell Resistance: Yes
A soft glow appears in your open hand shedding bright light in a 20-foot radius and dim light for an additional 20 feet.
In addition to providing illumination, you can direct rays of light against undead. You can project these rays up to 120 feet by making a ranged touch attack. If the ray hits an undead creature, it deals damage equal to 1d6 +1 point per caster level (maximum +5). Each attack you make reduces the remaining duration by 1 minute. If an attack reduces the remaining duration to 0 minutes or less, the spell ends after the attack resolves.
A light spell (one with the light descriptor) counters and dispels a darkness spell (one with the darkness descriptor) of an equal or lower level.[/sblock]
Wait, if this is a light spell that deals damage, shouldn't it deal one die larger damage against undead that are vulnerable to light or the maximum raised to +10 against them or something?