Deep Dhyanam can cleanse the aura, balance the seven chakras, balance the power of the eye's sight, recharge the brain, uniform our air flow (the breathing cycle), clarify our thoughts, and create a great source of power.This has more effects.Everyone  is talking of griefs and obstacles but none are thinking why it came. The reason behind it is that human heart and soul are filled with impurities. Both the heart and the soul got infested with impurities, and we are leading an unclear or undefinable life with the attitude of just surviving.
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This is what we will have to break, the impurities in our heart could be clarified better with the Ongara Deepa Dhyanam. Doing a Dhyanam as an individual and a group has much difference. Starting from the prehistoric age, when the prehistoric people prayed without any deities, the first (aruba) prayer was the prayer with jyothi (light). Deepa Dhyanam could be performed in certain times, with certain people, getting united with many human souls. This could be the time when the complete goodness of deepa dhyanam could be received. It couldn't be received on an everyday basis, so in Sathyodhayam, we do that on Thursdays  of every week.