Sorry, no helpful answer here, but since I had a Myo 5 before, I thought I’d reply just so you don’t feel ignored. :slight_smile:

Have you considered just replacing your Myo XP? I know it’s probably a very useful light, and well made like Petzl’s are, but by today’s standards, it’s not very bright for its size/weight. You could get a brighter headlamp, or one of similar brightness but longer runtime, or one of similar brightness and runtime but smaller size & weight. And if you get one with a good fixed beam pattern, not all flood and not all throw, I don’t think you’ll miss having that diffuser.

I loved my Myo 5 when I first got it. It blew me away. But within 2 yrs, I replaced it with something brighter and with more runtime. Now I have about 4 headlamps.