What are FL Pro TheraSpecs' visible light transmission (VLT)?

FL-Pro™ TheraSpecs come in three different tint strengths:

"Standard" - which filters 35% of light, "extra" - which filters 50% of light, and "max" which filters 74% of light.

All of these tint levels were designed to filter the most problematic wavelengths and provide protection against screens, fluorescents, LEDs, and other artificial lighting.