Spells – How does Split Ray apply to Light of Lunia?

I ran into the Lunia Light spell in the Spell Compendium (p132) and wondered how exactly Metamagic would apply. Split Ray in particular interests me, since I would love a way to get an additional beam.

Luneia light

Evocation (Good, Light)
Level: Celestia 1, Cleric 1, Sorcerer / Magician 1,
Components: V, S
Casting time: 1 standard action
Range: Medium (100 feet + 10 feet / level)
Objective: you and up to two rays; see text
Duration: 10 minutes / level (D) or until discharge; see text
Saving Throw: None
Spell Resistance: yes; see text

You invoke the powers of good and begin to shine with the silver light of the legendary Lunia, the first layer of the Seven Heaven of Celestia.
The silver glow created by this spell emanates from you within a 30-foot radius, and the dim light extends for an additional 30 feet.
Starting a turn after casting this spell, you can choose to spend part or all of Lunia's light as a ray of light. You must succeed in a remote touch attack with lightning to hit a target. You can perform a single tactile ranged attack that deals 1d6 points of damage or 2d6 points of damage against undead or evil strangers, with a range of 30 feet. Spell resistance applies to this attack. This dims its silver glow in half (15-foot light, with dim light for an additional 15 feet). You can choose to shoot an additional beam with the same characteristics in the same round or in a later round. Shooting the second ray extinguishes your glare and ends the spell.