OTG goggles reinforced with lip seal , visible light transmission: approx. 60% ,color: light gray 900-1050 DIRM LB6 LV CE (OD6+) >1050-1400 D LB7 IR LB8 M LB9 LV CE (OD9+) >1400-3000 D LB5 IRM LB4 LV CE (OD5+) >3000-<(><<)>9000 D LB5 I LB4 R LB2 LV CE (OD5+) >9000-11500 D LB5 I LB4 R LB2 LV CE (OD10+)