Each beam of light deals quadruple (4x) Isaac's tear damage.
A single beam of light can damage multiple enemies.
Synergies
Compound Fracture - Holy Light tears will have split tears with Holy Light effect; normal tears will not have split tears with Holy Light effect.
Cricket's Body - Holy Light tears will have split tears with Holy Light effect; normal tears will not have split tears with Holy Light effect.
The Parasite - Holy Light tears will have split tears with Holy Light effect; normal tears will not have split tears with Holy Light effect.
Lachryphagy - If Holy Light tears feed normal tears, fed normal tears will not gain Holy Light effect; however if normal tears feed Holy Light tears, it will just increase the size of fed Holy Light tears.