I had a dn70 that would strobe when in turbo. I made a video and contacted the vendor (can’t remember if it was gearbest or banggood…??) They only gave me a small in-store credit. I wasn’t entirely happy with that so emailed imalent with the video. I they said they had been made aware of the issue by the vendor then sent me a new light minus the battery. I was pretty happy with their service but I understand there are a number of faulty lights from imalent. The faulty one I gave away and have retained the replacement and a dn35.