Glasses lenses that provide UV protection are stamped with the letter “U” and a number indicating the ultraviolet light scale rating. Lenses rated for visible light are marked with “L” and a number. The letter “R” indicates an infrared filter. Welding glasses are marked “W” with a lens shade number.
Top 10 Best Aquarium UV Sterilizers 2021 - 1. Best Overall: Coodia Internal UV Light - 2. Best Premium Pick: Coralife Turbo-Twist UV Sterilizers - 3. Best Budget Pick: Coospider Aquarium Clean Light Submersible Waterproof Lamp 11WFortunately, the higher energetic part of UV-B; 280 – 295 nm, is filtered by the stratosphere and does not reach the earth’s surface, UV-A (315 – 400 nm), has energy between 389 and 300 KJ mol-1 and is less harmful for organic materials than UV-B. Visible (400 – 760 nm). and infrared (760 – 2500nm.)
Glass and plastic lenses filter out UV light! So the net result is a purple wash of light close to the 400nm range (the dividing point between visible violet and UV light)–not an effective form of black light. This results in a very poor effect. The reason is because certain UV paint pigments will not respond to 400nm light. This UV Filter is designed to block the visible and pass UV light, including 395nm and all other popular UV LED wavelengths. This UV Filter is also useful for near-UV fluorescence imaging, blocking visible light and light from UVC LED excitation sources. Useful Range: 335nm – 400nm. Tolerance: +/- 10nm. Connecting the UV Light. Insert the UV light bulb into the housing. Be very careful as the bulb and the glass sleeve that it slides into are extremely fragile. Once inserted, install the top of the housing. Then mount the power supply on the wall such that one the cord can reach the light and a GFI protected outlet.OD measures the attenuation of light passing through the laser filter. It is calculated by a mathematical expression. Using a formula, OD is measured in W/cm2, where W is the power density of the laser and cm2 is the area of the lens. While OD is a good indicator of the attenuation of light, it is not a precise measurement.H3TBQCc.