Lavender flowers and fragrance?

I just bought a bouquet of lavender flowers to give fragrance to my room. It smells good up close but it doesn't actually make my room smell nice at all. I used to have a friend that could get her room to smell like lavender just by putting these flowers in her room, but mine have no effect. Is there a way in making them give off their fragrance??

Answers:
Definitely different types of lavender give off different scents and strengths of those scents. See below link.

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