How is optical transparency determined of an intervening adherend to UV/blue-visible light?
Optical clarity does not necessarily translate to light transparency at the wavelengths used for curing (365 nm for UV and 470 nm for blue-visible light). Similarly, a material that is visibly opaque is not necessarily completely opaque to UV or blue-visible light. If curing through an intervening substrate, the use of a radiometer is required to measure the actual transmitted intensity of light.
