Since, again, light has an upward course and is considered as a remedy for darkness, therefore one should give lights. This is the conclusion of the scriptures.
यस्मादूर्ध्वगमेतत् तु तमसश्चैव भेषजम्। तस्मादूर्ध्वगतेर्दाता भवेदत्रेति निश्चयः॥