Inner worship has its own merit on the cord of truth. It is also called maanas puja; it is effective media to interact with supreme one on the plane of heart. Blemishes of heart wash out fast through the inner bath.
The ceremony of showing lighted lamp is performed to have vision unto truth of self at its core base and performing it within proves very effective to enlighten the inner pace for ultimate truth.
God is within self, service salutation and showing lighted lamps are done to him alone by holy men mostly without external show. After entering within, submission which is hard at outer periphery becomes easy for one and with submission alone lord of three sphere manifest to interact.
By rendering service within heart to one who is indestructible and boundless one reaches at the plane whereby unison becomes a mare formality.
Jai sri baba lal ji
May lord bless all.
Thanks please