Deepam Jyoti Parabrahma, Deepam Sarvatamopaha |

Deepena saadhyathe sarvam sandhyadeepa namostute ||

దీపం జ్యోతి పరబ్రహ్మ, దీపం సర్వతమోపహః |

దీపేన సాధ్యతే సర్వం సంధ్యాదీప నమోస్తుతే 

this deepam is of 3 sandhyas
morning midday evening

deepam is symbolic to represent the light of the transcendent absolute