These filters worked well for 390 nm. They appear to enhance the florescence response of the UV mineral specimens I have collected. By reducing some of the blue light, that was being emitted by the Ultraviolet lights that I use. There are no white dots on these filters as is shown in the images for them. They are just a dark blue in color. Of course the more of these you buy in one transaction the better the deal they are as the shipping cost is a base price of at least one.
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Extremely high quality UV 365nm Glass Filter. Very well packed and fast shipping. Thank you Tangsinuo Technology!!!