Which Oil Is Best for Lighting a Deepam?
Sesame, ghee, coconut, castor, mahua: every home has its own answer. Here is what each oil brings to the flame, and why so many families light the lamp with a blend of five.
Lighting the deepam is one of the simplest acts of worship in an Indian home, and one of the most constant. The lamp is lit at dawn and at dusk, through nine nights of Navarathiri, on every threshold for Deepavali and Karthigai Deepam. Yet the question of which oil to pour into the vilakku gets surprisingly different answers from one household to the next.
The short answer: pure sesame (gingelly) oil is the classic everyday lamp oil, ghee is the most auspicious offering, and a Pancha Deepam blend of five brings the strengths of each together. The longer answer is worth knowing, because each oil behaves differently in the flame.
"A good lamp oil lights easily, holds a calm flame, and asks for nothing but a clean wick."
The Five Traditional Lamp Oils
Sesame oil (gingelly, nallennai, til)
The most widely used lamp oil in South India, and the one most often recommended for the daily lamp. Sesame oil draws up a cotton wick evenly and burns with a steady, warm flame. It is the oil many families choose for Pradosham and for Shani worship.
Cow ghee
Ghee is considered the most auspicious offering to the lamp, and a ghee deepam is lit for special prayers, for Lakshmi on Deepavali and in the temple. It gives a soft golden flame and a gentle fragrance. On its own it is costly for everyday use and turns solid in cool weather, which is why it is often blended or used in ready ghee wicks.
Coconut oil
Light, clean and easy to ignite, coconut oil gives a bright flame. It is common in Kerala and coastal homes. Like ghee, it thickens when the weather turns cold.
Castor oil
Thick and slow, castor oil climbs the wick gradually and so lasts a long time in the lamp. In Tamil it is even called vilakkennai, "lamp oil". On its own it can be hard to light, which is why it works best as part of a blend.
Mahua oil (iluppai ennai)
Pressed from the seeds of the mahua (iluppai) tree, this is a traditional lamp oil in Tamil Nadu. It is a heavier oil that, like castor, helps the flame burn slowly and steadily.
What Is Pancha Deepam Oil?
Pancha deepam oil (pancha deepa ennai) is a blend of five lamp oils, the one many families prefer for the pooja lamp: sesame, ghee, coconut, castor and mahua, poured together so that the light oils help the lamp catch quickly while the heavy oils keep it burning slowly. Each is also offered for its own blessing, so the five together are considered a complete offering.
What to Look For, and What to Avoid
- Paraffin or liquid mineral oil
- Cheap filler oils with an unnamed "blend"
- Synthetic perfume to mask the smell
- Used or leftover cooking oil
- Every oil listed on the label
- Cold-pressed, unrefined plant oils
- Pure cow ghee for the auspicious flame
- A natural fragrance, or none at all
How to Light the Deepam Well
Wipe away old oil and carbon so the new flame burns clear.
Use pure cotton twisted wicks for a brass kuthuvilakku or a single wick for an agal vilakku.
Cover the base of the wick and leave about half a centimetre of the tip standing clear of the oil.
Light the tip, top up before the oil runs low, and trim a charred wick before relighting. Never leave a lamp near curtains or unattended.
For Deepavali and Karthigai Deepam
On festival nights the lamps multiply: rows of clay agal vilakku on every step and doorway for Karthigai Deepam (24 November 2026), and lamps in every room for Deepavali (8 November 2026). A litre of oil goes quickly across dozens of small lamps, so it is worth buying ahead, and worth choosing an oil that lights easily in a small clay lamp. Panchagavya lamps are a natural alternative to clay for the threshold.
PremaNature Pancha Deepam Oil
Cold-pressed sesame, coconut, mahua and castor oils with pure cow ghee, and a touch of patchouli for a soft, earthy fragrance. Blended and bottled at our ashram, with no paraffin, no mineral oil and no synthetic perfume.
Frequently Asked Questions
Which oil is best for the daily pooja lamp?
Pure sesame (gingelly) oil is the traditional everyday lamp oil. Many families prefer a Pancha Deepam blend, which combines sesame with ghee, coconut, castor and mahua for a lamp that lights easily and burns steadily.
Can I use ghee and oil together in the same lamp?
Yes. Pancha Deepam oil already includes ghee. You can also light a separate ghee lamp alongside an oil lamp for special prayers.
Can I use cooking oil to light a deepam?
Fresh, pure sesame or coconut oil works. Avoid used or leftover cooking oil and refined blends of unknown oils, which tend to smoke and are traditionally not offered to the lamp.
Why does lamp oil turn cloudy in winter?
Ghee and coconut oil thicken in the cold. It is natural and a sign that nothing has been added; warm the bottle in lukewarm water before pouring.
This article reflects traditional practice, which varies by family and region.