Tested while it was night. Even with a flashlight, the region where the welding was done was difficult to see through the whole mask that Svarog smart 2 provides. The spot where the welding was done is clear as day. The filter operates quite efficiently, and there is not the slightest amount of difficulty with the spot welding. Now it is visible to the bath, the arc, and the place where the welding is taking place, and at the same time it does not blind anyone. To boil it down, heaven and earth. It is preferable to invest the money on a mask once and have it protect your eyes than to struggle with them later on.