1. safety helmet Light to dark : 1/25,000s. 2. Dark to light:low to high 0.1s~1s, choice ... of 4 shelves, red LBD direction. 1. Auto-darkening Welding Safety ... be changed.10. Auto-darkening Welding Safety Helmet Switching time:a) Light to dark: 1/25,000s.b) ... /arc welding/Gas welding.15. Auto-darkening Welding Safety Helmet Colour: blue,green,silver,black,yellow,red, ...