Nitecore EF1 Explosion Proof CREE XM-L2 U3 LED Flashlight 18650 White 830 Lumens Black 6952506401741. e. NITECORE EF1 is safe to operate with the presence of class 1 group A (Acetylene) B (hydrogen) C (Ethylene) and D (Propane) gases This blinding 830...