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The high OD 7 provides the highest level of nd yag laser protection with attenuation of 10,000,000X at 1064nm. The L ratings demonstrate testing of the ability of the laser glasses to withstand a direct laser hit.
Wavelengths, Optical Densities & Specifications - Marked on Glasses
L-Rating
808-840 DIRM LB4
>840-950 + >1070-1090 DIRM LB5
>950-1070 D L6 + IRM LB7