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Hello Not sure if this should be in general, science or measurements section. After getting familiar with the fact that 532 nm lasers have a lousy efficency and that they waste 300 mA for nothing before starting to operate, and that my "5 mW" green pen uses 1.14W (for a nominal efficiency of...

Hello After getting six "5 mW" pen pointers, two 405 nm (violet), two 635 nm (orange), one 532 nm (orange) and one 650 nm (red) I wonder if these really are all 5 mW pointers. The red one is misaligned, and in addition to the dot, there is a semi-arc around it. The two orange ones were equally...

Hello I'd like to mail order protective glasses for me and the whole family. I need trustworthy and standardized glasses that a professional would use while working with class 3b equipment. I need IR and green protection. But how dim should the glasses be? How strong glasses does one need to...

Hello I got to try out an 50mW green laser, purchased from buywithcoins.com I have read about laser safety and everything, but I wonder if I got over excited. Pointing it downwards at a white wallpaper, it was not too uncomfortable from some 5ft distance. Pointing it under the leaves of a...