This year I started my lavender seeds (from the same batch as last year), under the same fluorescent lights (literally even on the same shelf) and at 70 degrees F. in my basement. The only difference this year was that I sprouted them in 100% fresh worm castings. They sprouted after just 7 days! now after 2 weeks total they are about 2" tall and have their 2nd set of true leaves. I can already smell the lavender smell if I get real close and give a good sniff.

All 4 seeds I started came up at the same time also, so I really don't think it was a coincidental thing with just one seed.
Anyway, take it for what it's worth. IDK why the castings would offer quicker germination, but it just seemed like it so I thought I'd throw it out there.