The LG-003 has a high OD 7 providing the highest level of nd yag laser protection with attenuation of 10,000,000X at 1064nm & 190-532nm. The L ratings demonstrate testing of the laser glasses to withstand a direct laser hit. They work well with or without prescription glasses.
Full specifications are shown below.
Protection (Wavelengths & Optical Densities) - Marked on Glasses
960-1064nm - OD 7+
190-534nm - OD 7+
925-1070nm - OD 6+
850-925nm - OD 5+
Visible Light Transmission (VLT) - 35%