"The Pillars of Light balance the energy in the space they are in and intensify, highten the radiation. The pillars of light, placed at the four corners of the house, radiate and encircle the house with a powerful radiance of harmony, coherence, protection. 
They are to be placed on the bottom floor if the house has several floors. Place them with the inclined side facing inwards, to intensify this radiation and create a cocoon of sattva in the space. Place them with the inclined side facing outward, to purify the space of any heavy or disharmonious energy. So, periodically, place the pillars facing outward, for 7 days the first time, then 7 hours every 7 days. The rest of the time, turn them towards the interior of the space. The size of the house or space does not matter. Place the pillars at the four corners. You can also use them for a single room, but their initial intention is to surround the home with a powerful curtain of light and harmony." 
~Guardians of the Flame