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Black Diamond Spot vs Petzl Duo S Headlamp
No sources that do their own in-depth testing have considered the Black Diamond Spot 200 to be a good enough purchase for it to earn a sport in their Headlamp roundups, which is typically a bad sign.
As for the Petzl Duo S Headlamp - it wasn't considered to be a good enough purchase to earn a spot in any roundups conducted by sources that perform objective hands-on testing, which typically indicates that a product isn't worth its asking price.
As a last step, we wanted to do a head-to-head Black Diamond Spot 200 vs. Petzl Duo S Headlamp comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.