I've been working in the fire service for more than ten years, and I can say for sure: a lot depends on the flashlight. Not long ago, I was recommended this option
best helmet flashlight for firefighters . At first, I was skeptical, but after the first trip in conditions of limited visibility, I was pleasantly surprised. Very powerful, lightweight, and reliable. It's attached conveniently, doesn't interfere with movement. Its battery holds up well even with active use. Many colleagues have also ordered after my recommendation. If you're looking for a professional solution, then this is a very worthy option.