There are many different variations of lavender oil, and each coming from different regions, carrying slightly diffferent properties. Here are just a few versions of Lavender and a couple of notes of comparison based solely on the camphor content.
Spike Lavender is known to be a less quality oil than other lavenders, being that is may be adulterated with other oils such as lavandin or other cheap oils. Spike Lavender has a higher camphor content than common lavender (Lavender Angustifolia), having anywhere between 10-20% camphor content. This type of lavender may be mildy neurotoxic (Essential Oil Safety, Tisserand and Young)
Spanish Lavender has an extremely high camphor content that can range any from 16-50%, this makes a huge differen when coming to safety and use of the oil. While lavender is generally preceived as a safe with no major hazards or contraindications it is good to note that a lavender high in camphor can be neurotoxic and should absolutely be avoided during pregnancy and breastfeeding. This oil is mainly produced in Portugal. (Essential Oil Safety, Tisserand and Young)
This lavender, the most commonly purchased and available lavender is low in camphor content at about 1-2%. This oil is often used in may topical applications and should always be properly diluted to avoid an skin irritation, using only .1% lavender in a carrier oil. It has also been said not to use Lavender with those who are taking blood thinners because of the coumarin content which have anti-coagulant properties. (International Certified Aromatherapy Institute, 2008)