A few months ago, I purchased a Niterider Lumina 350 from REI. It only came with a bar mount, but I heard that the helmet mount that comes with the 650 should work.
I emailed Niterider customer service, and asked if I could purchase the helmet mount separately. Craig Wilson from their customer service department asked me for my address and shipped me a helmet mount at no charge!
That's great customer service. They're earned a customer for life.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Kudos to Niterider