[quote CDMA ENG]UV cannot pass through glass.[/quote]Actually, glass is transparent to longer UV wavelengths, reflective to shorter UV wavelengths. This is why you do use a UV filter on cameras, particularly film types. With film, it tends to expose all colors, washing out the sky (deep blue sky ends up looking baby blue). With digital sensors, I am seeing almost the opposite behavior, where the sky gets a deeper blue w/o a UV filter. Behavior could depend upon manufacturer. Glass passes 90% of light above 350nm, but blocks below 90% below 300nm.
NOTE: Blacklights use a glass bulb. Woods glass used to be used, but now it is only a coating.
