Here are simple, Jain-dharma meanings:

• Mangal Divo (auspicious lamp): A lamp lit at the start of prayer or ritual to invite auspiciousness, dispel darkness, and remind devotees to seek spiritual illumination. It is placed before Tirthankaras or in the prayer space as a sign of reverence and to create a sacred atmosphere.

• Aarti: A devotional offering of light and praise. In Jain practice, Aarti refers to songs or stutis sung in praise of the Tirthankaras or revered teachers, often accompanied by a lamp or flame as a symbolic offering. It is a devotional act to express devotion and gratitude. Both Digambar and Shwetambar traditions use Aarti, though the exact songs and customs can vary between the two traditions. The essence remains: lighting and offering light as a symbol of spiritual light and reverence.

If you want, I can provide the exact Sanskrit phrases and their artha (meaning) from authentic Jain sources.