Purification/purity
Healing
Blessing
Protection
Peace
Truth-seeking
Honesty
White candles can also be used as a substitute for other candles, although this may affect the effectiveness of the spell.
White candles are perfect for meditation and cleansing. If you ever find yourself in a difficult situation and needing a break from the strong/overwhelming emotions, I recommend meditating with white candles. Meditation does not have to be sitting cross-legged on the floor with your eyes closed, but can also be relaxing on the sofa watching a nature documentary, or just anything that calms you and does not invoke strong emotions. If you can find a white candle with a calming scent (for example, a nostalgic scent), even better for sensory emersion.
Of course you could meditate with incense instead, or both. Or you could use wax melts in place of incense. However, wax melts should not be used in spell casting in place of candles, although there is no harm in having the room smell nice during the casting.