Any witch worth her salt knows there's no such thing as too many candles, especially if you're a regular practitioner of candle magick.
Candles have been associated with magick and spirituality since antiquity.
One of the ways the candle affects the magick is the colour of the candle. Different colour candles have different magical associations, so the focus of the spell will be different depending on the color.
Here are the common magical associations of various candle colours:
White: purification, clarity, truth
Black: banishing negativity, protection, binding, trances
Red: passion, love, lust, courage, strength, life force
Pink: friendship, self-love, compassion, empathy, emotional healing, the feminine
Yellow: joy, energy, creativity, intelligence
Orange: success, power, encouragement, confidence, authority
Green: money, luck, fertility, abundance, growth, wealth, prosperity
Dark blue: depression, vulnerability, changes
Light blue: health, patience, healing, peace, serenity, meditation
Purple: psychic powers, wisdom, intuition, hidden knowledge, spiritual power
When in doubt (or lacking a coloured candle to correspond with your spell) a white candle will always serve you well, as it's a magical clean slate.